Odisha State Board CHSE Odisha Class 12 Invitation to English 1 Solutions Chapter 5 Development of Polio Vaccines Textbook Exercise Questions and Answers.
CHSE Odisha 12th Class English Solutions Chapter 5 Development of Polio Vaccines
CHSE Odisha Class 12 English Development of Polio Vaccines Text Book Questions and Answers
Unitwise Gist and Glossary
UNIT -I
Gist:
The writer takes us back to 1921 when America became a victim of polio. Franklin D. Roosevelt, a young politician, was not an exception. A tiring day made him take a cold The writer takes us back to 1921 when America became a victim of polio. Franklin D. Roosevelt, a young politician, was not an exception. A tiring day made him take a cold swim and lie leisurely in his wet swimsuit at home. He went to bed feeling as if he had caught a cold.
In a few days, he came to know that he was suffering from polio. The early symptoms of poor attack are headache, nausea, vomiting, and fever. Air, food, and water are the carriers of poliovirus. One percentage of polio-infected people actually suffer from severe polio. There are two forms of polio: spinal and bulbar; the former affects the limbs and the latter lung. Muscle pain, and stiff neck and back characterize both forms. The symptoms of both forms of polio are similar.
ସାରମର୍ମ :
ଲେଖକ ଆମକୁ ୧୯୨୧ ମସିହାର ପୃଷ୍ଠଭୂମିକୁ ଫେରାଇ ନେଇଛନ୍ତି ଯେତେବେଳେ ଆମେରିକା ପୋଲି ଓ ବ୍ୟାଧର ଶିକାର ହୋଇଥିଲା । ଯୁବ ରାଜନୀତିଜ୍ଞ Franklin D. Roosevelt ଏହାର ବ୍ୟତିକ୍ରମ ନ ଥିଲେ । ଏକ କ୍ଲାନ୍ତ ଦିବସରେ ସେ ଥଣ୍ଡା ପାଣିରେ ପହଁରିଥିଲେ ଓ ଓଦା ସନ୍ତରଣ-ପୋଷାକ ପରିଧାନ କରି ଘରେ ଶୋଇ ରହିଥିଲେ । ସେ ଯେତେବେଳେ ଶୋଇବାକୁ ଗଲେ, ସେ ଅନୁଭବ କଲେ ଯେପରିକି ତାଙ୍କୁ ଥଣ୍ଡା ହୋଇଛି । କିଛି ଦିନ ଭିତରେ ସେ ପୋଲିଓ ରୋଗରେ ପୀଡ଼ିତ ହୋଇଥିବାର ଜାଣିବାକୁ ପାଇଲେ । ପୋଲିଓ ସଂକ୍ରମଣର ପ୍ରାକ୍-ଲକ୍ଷଣଗୁଡ଼ିକ ହେଲା – ମୁଣ୍ଡବ୍ୟଥା, ଅସ୍ୱସ୍ଥି ଲାଗିବା, ବାନ୍ତି ଏବଂ ଜ୍ଵର । ବାୟୁ, ଖାଦ୍ୟ ଏବଂ ଜଳ ହେଉଛି ପୋଲିଓ ଭୂତାଣୁର ବାହକ । ପୋଲିଓ ଆକ୍ରାନ୍ତ ବ୍ୟକ୍ତିମାନଙ୍କ ମଧ୍ୟରୁ ବାସ୍ତବରେ ୧ ପ୍ରତିଶତ ମାରାତ୍ମକ ପୋଲିଓରେ ପୀଡ଼ିତ ହୋଇଥା’ନ୍ତି । ପୋଲିଓ ଦୁଇପ୍ରକାର; ଯଥା – spinal (ମେରୁଦଣ୍ଡ ସମ୍ବନ୍ଧୀୟ) ଓ bulbar (ଫୁସ୍ଫୁସ୍ ସମ୍ବନ୍ଧୀୟ) । ପ୍ରଥମଟି ଅଙ୍ଗପ୍ରତ୍ୟଙ୍ଗକୁ ଏବଂ ଦ୍ବିତୀୟଟି ଫୁସ୍ଫୁସ୍ ଆକ୍ରାନ୍ତ କରିଥାଏ । ମାଂସପେଶୀ ଯନ୍ତ୍ରଣା, ବେକ ଓ ପିଠି ଲାଠି ହୋଇଯିବା ଉଭୟ ପ୍ରକାର ପୋଲିଓର ବୈଶିଷ୍ଟ୍ୟ । ଉଭୟ ପ୍ରକାର ପୋଲିଓର ଲକ୍ଷଣ ସମାନ ।
Glossary:
outbreak : sudden occurrence (ବ୍ୟାପିବା)
plagued : caused trouble for a period of time (କିଛି ସମୟ ପାଇଁ ଅସୁବିଧା ସୃଷ୍ଟି କରିଥିଲା )
poliomyelitis : polio virus (ପୋଲି ଓ ଭୂତାଣୁ )
taking a cold swim : ଥଣ୍ଡା ପାଣିରେ ପହଁରିବା
relief : ଆରାମ
swimsuit : ସନ୍ତରଣ ପୋଷାକ
strike : deliver a blow (ଆଘାତ ଦେବା )
vinis : ଭୂତାଣୁ
incubate : hatch (ଅଣ୍ଡା ଫୁଟାଇବା )
a symptomatic: In medicine, a disease is considered asymptomatic if a patient is a carrier for a disease or infection but experiences no symptoms.
symptoms :
stage : condition (ଅବସ୍ଥା )
infected: ସଂକ୍ରମିତ
droplets: a very small drop of a liquid (ବୁନ୍ଦା)
antibodies : antibodies (1g) are found in blood or other bodily fluids of vertebrates, and are used by the immune system to identify and neutralize foreign objects, such as
bacteria and viruses.
unlucky : ଭାଗ୍ୟହୀନ
permanently : ସବୁଦିନ ପାଇଁ
paralyzed : ଅଚଳ ହୋଇଗଲା
spinal cord : ମେରୁଦଣ୍ଡସ୍ଥ ସ୍ନାୟୁ ସଂସ୍ଥାନ
multiplies : increases (ବଢ଼ିଯାଏ)
nerves : ସ୍ନାୟୁ
affected : ପ୍ରଭାବିତ ହେଲା
pain : ଯନ୍ତ୍ରଣା
stiff : unable to move easily (ଅଚଳ)
lungs : ଶ୍ଵାସନଳୀ
breathe : ନିଃଶ୍ଵାସ ନେବା
physical therapy: ଶାରୀରିକ ଚିକିତ୍ସା
recover : cure (ଭଲ ହୋଇଯିବା)
varies : changes (ପରିବର୍ତ୍ତନ ହୁଏ)
Think it:
Question 1.
What is poliomyelitis ?
Answer:
Poliomyelitis means poliovirus. It causes an acute, viral, infectious disease that spreads from person to person, basically via the fecal-oral route.
Question 2.
When did Roosevelt find out that he had polio?
Answer:
On a tiring day, Roosevelt took a cold swim and lie leisurely in his wet swimsuit at home. When he went to bed, he felt as if he had caught a cold. After a few days, he found out that he had polio.
Question 3.
What are the early symptoms of a polio attack?
Answer:
The early symptoms of polio attack are flue – like symptoms like headache, nausea, vomiting, and fever.
Question 4.
Which things are the carriers of poliovirus?
Answer:
The carriers of poliovirus are air, water, and food.
Question 5.
What percentage of people attacked by poliovirus actually suffer from severe polio?
Answer:
One percentage of people attacked by poliovirus actually suffer from severe polio.
Question 6.
What are the two forms of polio?
Answer:
The two forms of polio are spinal and bulbar.
Question 7.
Are the symptoms of both forms of polio similar or different? Which form of the disease is more dangerous?
Answer:
The symptoms of both forms of polio are similar. The bulbar form of the disease is more dangerous.
UNIT – II
Gist:
Roosevelt was keen on not allowing dangerous polio to dominate him. It left his long-term career as the President of the USA untouched. He led the fight against polio by increasing public awareness of the deadly disease and promoting research. Polio never destroyed the large bulk of the population like plague or influenza. Instead, it was a fearful, highly contagious disease that affected all, irrespective of rich or poor, when it occurred in a deadly manner. It seemed as if advances in science paled into insignificance before this disease. The first half of the nineteenth century witnessed tremendous advancement in basic hygiene methods and knowledge. A great change had come in our civilization for the first time. The people’s mere hope for good health gave way to expectations. Children were the worst sufferers of polio. The panic-stricken parents were afraid of sending their children to schools in the early 1950s because there was no vaccine for the treatment of polio.
ସାରମର୍ମ :
ବିପଜ୍ଜନକ ପୋଲିଓକୁ ତାଙ୍କ ଉପରେ ପ୍ରଭାବ ବିସ୍ତାର କରାଇ ନ ଦେବାକୁ Roosevelt ଦୃଢ଼ସଂକଳ୍ପ ଥିଲେ । ଯୁକ୍ତରାଷ୍ଟ୍ର ଆମେରିକାର ରାଷ୍ଟ୍ରପତି ଭାବେ ତାଙ୍କର ଦୀର୍ଘ ରାଜନୈତିକ ଜୀବନ ନିରାପଦ ରହିଥିଲା । ବିପଜ୍ଜନକ ବ୍ୟାଧ୍ ସମ୍ବନ୍ଧରେ ଜନସଚେତନତା ସୃଷ୍ଟି କରି ଏବଂ ଗବେଷଣାକୁ ପ୍ରୋତ୍ସାହନ ଦେଇ ସେ ପୋଲିଓ ବିରୁଦ୍ଧରେ ସଂଗ୍ରାମ କଲେ । ପ୍ଲେଗ୍ ବା ଇନ୍ଫ୍ଲୁ ଏଞ୍ଜା ଭଳି ଏହା ଅଧିକାଂଶ ଲୋକଙ୍କୁ ମୃତ୍ୟୁମୁଖକୁ ଠେଲି ଦେଉନଥିଲା । ଅପରପକ୍ଷେ ଏହା ଏକ ଭୟ ଉଦ୍ରେକକାରୀ ପ୍ରବଳ ସଂକ୍ରାମକ ରୋଗ ଥିଲା ଯାହାକି ଭୟଙ୍କର ଭାବେ ବ୍ୟାପୁଥିବା ସମୟରେ ଧନୀ, ଦରିଦ୍ର, ନିର୍ବିଶେଷରେ ସମସ୍ତଙ୍କୁ ଆକ୍ରାନ୍ତ କରୁଥିଲା । ବିଜ୍ଞାନର ଅଗ୍ରଗତି ଏହି ରୋଗ ନିକଟରେ ପରାଭୂତ ହେଲା ଭଳି ପ୍ରତୀୟମାନ ହେଉଥିଲା । ଊନବିଂଶ ଶତାବ୍ଦୀର ଆଦ୍ୟ ଭାଗରେ ମୌଳିକ ପରିମଳ ବ୍ୟବସ୍ତା ଓ ଜ୍ଞାନ କ୍ଷେତ୍ରରେ ପ୍ରଭୃତ ଅଗ୍ରଗତି ଘଟିଥିଲା । ପ୍ରଥମ ଥର ପାଇଁ ଆମ ସଭ୍ୟତାରେ ଏକ ବିରାଟ ପରିବର୍ତ୍ତନ ଆସିଥିଲା । ଉତ୍ତମ-ସ୍ୱାସ୍ଥ୍ୟ ପାଇଁ ଲୋକମାନଙ୍କ ଆଶା ଅନେକ ସମ୍ଭାବନା ସୃଷ୍ଟି କରିଥିଲା । ପୋଲିଓଦ୍ୱାରା ପିଲାମାନେ ଦୟନୀୟଭାବେ ପୀଡ଼ିତ ହେଉଥିଲେ । ୧୯୫୦ଦଶକ ପ୍ରାରମ୍ଭରେ ଭୀତତ୍ରସ୍ତ ପିତାମାତାମାନେ ସେମାନଙ୍କ ପିଲାମାନଙ୍କୁ ବିଦ୍ୟାଳୟକୁ ପଠାଇବାକୁ ଭୟ କରୁଥିଲେ । କାରଣ ପୋଲିଓର ଚିକିତ୍ସା ନିମନ୍ତେ ସେତେବେଳେ କୌଣସି ପ୍ରତିଷେଧକ ନ ଥିଲା ।
Glossary:
determined : keen (ଦୃଢ଼ସଂକଳ୍ପ କରିଥିଲେ)
let : allow (ଅନୁମତି ଦେବା)
major : ବଡ଼
get the best of : conquer (ଜୟ କର )
illustrious : famous and much admired (ବିଖ୍ୟାତ ଓ ପ୍ରଶଂସିତ)
political career : ରାଜନୈତିକ ଜୀବନ
long term : ଦୀର୍ଘଦିନ
spearhead (h) : lead an attack (ନେତୃତ୍ୱ ନେବା)
fight : ଯୁଦ୍ଧ କର
public awareness : ଜନସଚେତନତା
deadly : ପ୍ରାଣଘାତୀ
promoting : ପ୍ରୋତ୍ସାହିତ କରିବା
research : ପ୍ରୋତ୍ସାହିତ କରିବା
devastated : destroyed completely (ସମ୍ପୂର୍ଣ୍ଣ ଭାବରେ ନଷ୍ଟ
population : ଜନସଂଖ୍ୟା
plague : ମହାମାରୀ
influenza : ବ୍ୟାପକ ସର୍ଦ୍ଦି
contagious disease : disease that spreads by people touching each other (ସଂକ୍ରାମକ ବ୍ୟାଧ୍)
terrifying : ଭୟଙ୍କର
in spite of : ସତ୍ତ୍ବେ
advance : ପ୍ରଗତି
century : hundred years (ଶତାବ୍ଦୀ)
basic : ପ୍ରାରମ୍ଭିକ
tremendously : ବହୁଳ ପରିମାଣରେ
civilization : ସଭ୍ୟତା
instead of : ପରିବର୍ତ୍ତେ
vulnerable : easily hurt physically (ସହଜରେ ସଂକ୍ରମିତ ହେବା / ସହଜରେ ପ୍ରଭାବିତ ହେବା)
heartbreaking : ହୃଦୟବିଦାରକ
crutches : ଆଶାବାଡ଼ି
lacking : want (ଅଭାବ)
panicked : ଭୟଭୀତ ହୋଇଗଲେ
cumbersome : large and heavy (ବଡ଼ ଓ ଭାରୀ )
Think it out:
Question 1.
Did polio affect Roosevelt’s political career?
Answer:
Polio did not affect Roosevelt’s political career. Instead, he enjoyed a distinguished long-term Presidency of the United States.
Question 2.
What was the highest position did Roosevelt achieve in his political career?
Answer:
Roosevelt became one of the most distinguished Presidents of the United States. His position was not short-lived. He enjoyed a long-term political career at the highest level.
Question 3.
How did he spearhead the fight against polio?
Answer:
He spearheaded the fight against polio by increasing public awareness of the dangerous disease and promoting research.
Question 4.
Who are the most vulnerable to polio?
Answer:
Children are the most vulnerable to polio.
Question 5.
Why were parents in the early 1950s afraid of sending their children to schools?
Answer:
Parents in the early 1950s were afraid of sending their children to school because there were no vaccines for the treatment of polio.
UNIT – III
Gist:
The story of vaccine developments for polio dates back to the early 1900s. Early attempts fell through because of the lack of researchers’ knowledge that there existed more than one virus. It is now known that polio is attributed to three strains of completely stable viruses. Ironically, some children were immune to polio before the 1900s, because of deplorable sanitary conditions and primitive efforts in connection with sewage and water treatments. With the improvement in sanitary methods, children were not exposed to poliovirus any longer. As a result, they did not develop antibodies to the virus. Paradoxically, their exposure to the virus during later childhood and adulthood made them run the risk of contracting polio. In the meantime, March of Dimes, a foundation in the United States, emerged on the scene. Thanks to President Roosevelt, this organization worked for the elimination of polio by enlisting the services of a competent researcher who was sure of finding a danger-free vaccination.
ସାରମର୍ମ :
ପୋଲିଓ ପ୍ରତିଷେଧକ ପ୍ରସ୍ତୁତିର କାହାଣୀ ଊନବିଂଶ ଶତାବ୍ଦୀର ଆଦ୍ୟଭାଗରୁ ଆରମ୍ଭ ହୋଇଥିଲା । ପ୍ରାରମ୍ଭିକ ପ୍ରୟାସ ବ୍ୟର୍ଥ ହୋଇଥିଲା କାରଣ ପୋଲିଓର ଏକାଧ୍ଵକ ପ୍ରକାର ଭୂତାଣୁ ଥିବା କଥା ଗବେଷକମାନେ ଜାଣିନଥିଲେ । ଏବେ ଜଣାପଡ଼ିଲା ଯେ ପୋଲିଓ ତିନିପ୍ରକାର ସମ୍ପୂର୍ଣ୍ଣ ସ୍ଥିର ଭୂତାଣୁଦ୍ବାରା ସୃଷ୍ଟି ହେଉଛି । ବିଡ଼ମ୍ବନାର କଥା ଯେ ଊନବିଂଶ ଶତାବ୍ଦୀ ପୂର୍ବରୁ ଦୁଃସ୍ଥ ପରିମଳ ବ୍ୟବସ୍ଥା, ନାଳନର୍ଦ୍ଦମା ପରିଷ୍କରଣର ପୁରୁଣାକାଳିଆ ବ୍ୟବସ୍ଥା, ଜଳବିଶୋଧନ ଅବ୍ୟବସ୍ଥା କାରଣରୁ କେତେକ ପିଲା ପୋଲିସ ସଂକ୍ରମଣରୁ ମୁକ୍ତ ଥିଲେ । ପରିମଳ ବ୍ୟବସ୍ଥାର ଉନ୍ନତି ପରେ ପିଲାମାନେ ପୋଲିଓ ଭୂତାଣୁ ସଂସର୍ଗରୁ ରକ୍ଷା ପାଇପାରିଲେ । ଫଳରେ ସେମାନଙ୍କ ଶରୀରରେ ଭୂତାଣୁ ପ୍ରତିରୋଧକ ଶକ୍ତି ସୃଷ୍ଟି ହେଲା ନାହିଁ । ଆଶ୍ଚର୍ଯ୍ୟର କଥା ଯେ ପରବର୍ତ୍ତୀ ବାଲ୍ୟାବସ୍ଥା ଓ ବୟସ୍କାବସ୍ଥାରେ ସେମାନଙ୍କର ଭୂତାଣୁ ସଂସର୍ଗରେ ଆସିବାଦ୍ଵାରା ପୋଲିଓ ରୋଗାକ୍ରାନ୍ତ ହେବାର ବିପଦ ବଢ଼ିଗଲା । ଇତ୍ୟବସରରେ March of Dimes ନାମକ ଆମେରିକାର ଏକ ଅନୁଷ୍ଠାନର-ଦୃଶ୍ୟପଟ୍ଟରେ ଆବିର୍ଭାବ ହେଲା । ରାଷ୍ଟ୍ରପତି Rooseveltଙ୍କଦ୍ଵାରା ଅନୁପ୍ରାଣିତ ହୋଇ ଏହି ସଂସ୍ଥା ପୋଲିଓର ଦୂରୀକରଣ ନିମନ୍ତେ ଜଣେ ଯୋଗ୍ୟ ଗବେଷକଙ୍କ ସହାୟତାରେ କାର୍ଯ୍ୟରତ ଥିଲା ଯିଏକି ଏକ ବ୍ୟବସ୍ଥା ବାହାର କରିପାରିବେ ବୋଲି ନିଶ୍ଚିତ ଥିଲେ ।
Glossary:
quite : ସମ୍ପୂର୍ଣ୍ଣ
strain : a distinct breed (ଭିନ୍ନ ପ୍ରକାରର )
stable : ସ୍ଥିର
enterovirus : viruses that cause gastro-intestinal illness (ପରିପାକ ଓ ଅନ୍ତନଳୀ ଜନିତ ଅସୁସ୍ଥତା ସୃଷ୍ଟିକାରୀ ଭୂତାଣୁ)
RNA : Ribonucleic acid (RNA) is one of the three major macromolecules (along with DNA and proteins) essential for all known forms of life. (ରାଇବୋନ୍ୟୁକ୍ଲିକ୍ ଏସିଡ୍)
effective : ଫଳପ୍ରଦ
ironically : ବିଡମ୍ବନାର ବିଷୟ
sanitation condition : ପରିମଳ ଅବସ୍ଥା
effort : ପ୍ରଚେଷ୍ଟା
sewage : ନର୍ଦ୍ଦମାର ମଇଳା
primitive : ପୁରୁଣାକାଳିଆ
infant : ଶିଶୁ
consequently : ଫଳସ୍ୱରୂପ
later : ପରବର୍ତ୍ତୀ
childhood : ବାଲ୍ୟକାଳ
adulthood : ବାଲ୍ୟାବସ୍ଥା
painstaking : ଆୟସସାଧ୍ୟ
funded : ଆର୍ଥିକ ସାହାଯ୍ୟ ଯୋଗାଇ
March of Dimes: a Foundation in the United States that works to improve the health of mothers and babies. ft was originally founded by Franklin D. Roosevelt in 1938 to
combat polio. (ମା’ ଓ ଶିଶୁମାନଙ୍ଗ ସ୍ୱାସ୍ଥ୍ୟବସ୍ଥାର ଉନ୍ନତି କଳ୍ପେ କାର୍ଯ୍ୟ କରୁଥିବା ଏକ ଆମେରିକୀୟ ସଂସ୍ଥା)
grassroot : basic level (ତୃଣମୂଳ / ପ୍ରାଥମିକ ସ୍ତର )
enlist : (here) utilise
respected : ସମ୍ମାନୀୟ
safe : ନିରାପଦ
Think it out:
Question 1.
Why did early attempts at the development of the polio vaccine fail?
Answer:
Early attempts at the development of the polio vaccine failed because of the researcher’s lack of knowledge concerning the existence of more than one virus.
Question 2.
Why were some children immune to polio before the 1900s?
Answer:
Some children were immune to polio before the 1900s because sanitary conditions and primitive efforts in connection with sewage and water treatments were quite deplorable. Besides, through breastfeeding their mothers’ antibodies passed onto them played a great role.
Question 3.
Did improved sanitation help to avoid polio attacks before the 1900s?
Answer:
Improved sanitation did not help to avoid polio attacks before the l900s, because of not being exposed to poliovirus in their infancy, they did not develop antibodies to the viruses. As a result, when they were exposed to the virus in later childhood and adulthood they ran the risk of suffering from polio.
Question 4.
How did the March of Dimes work for the elimination of polio?
Answer:
The March of Dimes worked for the elimination of polio with its decision to utilize the services of a venerable researcher who was sure of finding a safe vaccination.
UNIT – IV
Gist:
This part begins with the editors’ eloquent reference to Dr. Jonas Salk who started his medical career studying immunology. In 1947, while at the University of Pittsburgh, he began his research on poliovirus. He used a method of developing poliovirus in cell culture. In 1952, Salk developed a successful vaccine resorting to a blend of three types of virus, found in monkey kidney cultures. He was instrumental in developing a process with the use of formalin, a chemical that made the whole virus inactive.
Dr. Salk’s research gave rise to the scope of clinical trials which created an unprecedented history in medical science. This resulted in the spectacular reduction of polio. However, there was a problem with the original Salk vaccine. The vaccine in reality caused 260 cases of polio and consequently 10 deaths. Some virus particles were not completely inactivated. This did not last long. The problem was solved. Ever since the result has been quite effective. Salk’s vaccine is given in two intramuscular injections administered in a span of one month and in need of boosters every five years. Then came Albert Bruce Sabin who developed or oral form of the vaccine.
The advantages of an oral vaccine are its long-lasting immunity, the prevention of reinfection of the digestive tract, and the administering of the vaccine at a cheap cost. But it is not an unmixed blessing. A live, oral virus is not applicable to patients with a compromised immune system. The Sabin oral vaccine has another disadvantage. Patients suffering from enterovirus infection of the gastrointestinal tract may not develop the immune response at the time of taking the oral vaccine. Last but not least, both vaccines have their merits and demerits.
ସାରମର୍ମ :
ଏହି ଅଂଶର ଆରମ୍ଭରେ ଲେଖକ ଡକ୍ଟର Jonas Salkଙ୍କ ବିଷୟରେ ସ୍ପଷ୍ଟ ମନ୍ତବ୍ୟ ଦେଇଛନ୍ତି ଯିଏକି ସଂକ୍ରମଣ ପ୍ରତିରୋଧ ବିଷୟରେ ଅଧ୍ୟୟନ କରି ଚିକିତ୍ସକର ଜୀବନ ଆରମ୍ଭ କରିଥିଲେ । ୧୯୪୭ ମସିହା ପିଟସ୍ଵର୍ଗ ବିଶ୍ବବିଦ୍ୟାଳୟରେ ଥିବାବେଳେ ସେ ପୋଲିଓ ଭୂତାଣୁ ଉପରେ ଗବେଷଣା ଆରମ୍ଭ କରିଥିଲେ । ସେ କୋଷୀୟ ପୋଷଣ ମାଧ୍ୟମରେ ପୋଲିଓ ଭୂତାଣୁକୁ ବଢ଼ାଇବାର ପଦ୍ଧତି ବ୍ୟବହାର କରିଥିଲେ । ୧୯୫୨ ମସିହାରେ Salk ମାଙ୍କଡ଼ ବୃକ୍କରେ ବଢ଼ୁଥିବା ତିନି ପ୍ରକାର ଭୂତାଣୁ ସମ୍ମିଶ୍ରଣରେ ଏକ ଫଳପ୍ରଦ ପ୍ରତିଷେଧକ ପ୍ରସ୍ତୁତ କରିଥିଲେ । ଫରମାଲିନ୍ ନାମକ ରାସାୟନିକ ପଦାର୍ଥ ବ୍ୟବହାର କରି ସେ ଏକ ପଦ୍ଧତି ଆବିଷ୍କାର କରିବାରେ ମୁଖ୍ୟ ଥିଲେ ଯାହାକି ସମସ୍ତ ଭୂତାଣୁଙ୍କୁ ନିଷ୍କ୍ରିୟ କରିଦେଉଥ୍ଲା ।
ଡକ୍ତର Salkଙ୍କ ଗବେଷଣା ଚିକିତ୍ସା କ୍ଷେତ୍ରରେ ପରୀକ୍ଷଣ ପାଇଁ ସୁଯୋଗ ସୃଷ୍ଟି କରିଥଳା, ଯାହାକି ଭେଷଜ ବିଜ୍ଞାନ କ୍ଷେତ୍ରରେ ଅଭୂତପୂର୍ବ ଇତିହାସ ସୃଷ୍ଟି କରିଥିଲା । ମାତ୍ର ମୂଳ Salk ପ୍ରତିଷେଧକରେ ସମସ୍ୟା ଥିଲା । ବାସ୍ତବରେ ଏହା ୨୬୦ ଜଣଙ୍କୁ ପୋଲିଓ ବ୍ୟାଧୁଗ୍ରସ୍ତ କରାଇଥିଲା ଏବଂ ୧୦ ଜଣ ମୃତ୍ୟୁବରଣ କରିଥିଲେ । କେତେକ ଭୂତାଣୁ ସମ୍ପୂର୍ଣ୍ଣରୂପେ ନିଷ୍କ୍ରିୟ ହୋଇନଥିଲେ । କିନ୍ତୁ ଏହି ସମସ୍ୟା ବେଶିଦିନ ରହିନଥିଲା । ଏହାର ସମାଧାନ ହୋଇଥିଲା । ସେହିଦିନଠାରୁ ଫଳାଫଳ ଉତ୍ତମ ହୋଇଆସୁଛି । Salkଙ୍କ ପ୍ରତିଷେଧକ ଏକ ମାସ ବ୍ୟବଧାନରେ ଦୁଇଟି ଟୀକା ଜରିଆରେ ମାଂସପେଶୀ ମଧ୍ଯରେ ଦିଆଯାଉଥିଲା ଏବଂ ପ୍ରତି ପାଞ୍ଚ ବର୍ଷରେ ବୁଷ୍ଟର ଟୀକା ଦେବାର ଆବଶ୍ୟକତା ଥିଲା । ୧୯୫୭ ମସିହାରେ ଦୃଶ୍ୟପଟ୍ଟରେ Albert Bruce Sabinଙ୍କର ଆବିର୍ଭାବ ହେଲା
ଯିଏକି ପାଟିରେ ଖିଆଯାଉଥିବା ଏକପ୍ରକାର ପ୍ରତିଷେଧକ ପ୍ରସ୍ତୁତ କରିଥିଲେ । ପାଟିରେ ଖିଆଯାଉଥିବା ପ୍ରତିଷେଧକର ଉପକାରଗୁଡ଼ିକ ଦୀର୍ଘ ପ୍ରତିଷେଧକ ଶକ୍ତି, ପରିପାକ ତନ୍ତ୍ରର ପୁନଃସଂକ୍ରମଣରୁ ରକ୍ଷା ଏବଂ ପ୍ରତିଷେଧକ ପ୍ରଦାନରେ କମ୍ – ଖର୍ଚ୍ଚାନ୍ତ ହେବା । ଏହା ଏକ ଅପକାରିତାଶୂନ୍ୟ ଆଶୀର୍ବାଦ ନ ଥିଲା । ଦୁର୍ବଳ ପ୍ରତିରୋଧକ ଶକ୍ତିସମ୍ପନ୍ନ ରୋଗୀମାନଙ୍କ କ୍ଷେତ୍ରରେ ଏକ ଜୀବନ୍ତ ପାଟିରେ ଖିଆଯାଉଥିବା ଭୂତାଣୁ ପ୍ରୟୋଗ କରାଯାଇପାରିବ ନାହିଁ । ଏହାର ଅନ୍ୟ ଏକ ଅପକାରିତା ଥିଲା । ଅନ୍ତନଳୀରେ ସଂକ୍ରମଣ ଭୋଗୁଥିବା ରୋଗୀମାନଙ୍କୁ ପାଟିରେ ଖିଆଯାଉଥିବା ପ୍ରତିଷେଧକ ଦେଲେ ସେମାନଙ୍କଠାରେ ପ୍ରତିରୋଧକ ଶକ୍ତି ବୃଦ୍ଧି ପାଉନଥିଲା । କିନ୍ତୁ ନିଃସନ୍ଦେହରେ ଏହା କୁହାଯାଇପାରେ ଯେ ଉଭୟ ପ୍ରତିଷେଧକର ଉଭୟ ଭଲ ଏବଂ ମନ୍ଦ ଗୁଣ ଅଛି ।
Glossary:
Pr. Jonas Salk: Jonas Edward Salk (1914-1995) was an American medical researcher and virologist, best known for his discovery and development of the first sale and most effective polio vaccine.
immunology: the scientific study of protection against disease (ରୋଗ ପ୍ରତିରୋଧ
cell culture: Cell culture is the complex process by which cells are grown under controlled conditions, generally outside of their natural environment. ପୋଷଣ )
massive: ବହୁଳ ଭାବରେ
unprecedented : ଅଭୂତପୂର୍ବ
spectacularly : ଆଶ୍ଚର୍ଯ୍ୟଜନକ ଭାବରେ
oral form of vaccine: ପାଟିରେ ଖିଆଯାଉଥିବା
Albert Bruce Sabin : Albert Bruce Sabin (1906-1993) was an American medical researcher best known for having developed an oral polio vaccine.
intramuscular injections : medicinal doses injected into the muscle
booster : a second dose of medicine given w strengthen the earlier dose (ଶକ୍ତିବର୍ଦ୍ଧକ ଔଷଧ)
endemic region : intected area (ସଂକ୍ରମିତ ଅଞ୍ଚଳ)
long-lasting : ଦୀର୍ଘସ୍ଥାୟୀ
reinfection : ପୁନଃସଂକ୍ରମଣ
digestive tract : ପରିପାକ ତନ୍ତ୍ର
administering : ଦେବା
sterile syringes : disinfccted injection syringes
disadvantage : demerit (ଅପକାର)
contact : ସଂସର୍ଗ
transniincd : ସ୍ଥାନାନ୍ତରିତ ହୋଇଯିବା
immunocompromised: a body that does not have good immunity, the ability to defend against illness (ଦୁର୍ବଳ ପ୍ରତିରୋଧକ କ୍ଷମତାସମ୍ପନ୍ନ )
relative : ଆପେକ୍ଷିକ
safety : ନିରାପଦ
cost : ମୂଲ୍ୟ
Think about it:
Question 1.
What method did Jonas Salk use to develop the polio vaccine?
Answer:
Jonas Salk used a method of growing poliovirus in cell culture to develop the polio vaccine.
Question 2.
How did Salk develop a successful vaccine?
Answer:
Salk developed a successful vaccine using a combination of the three types of virus, grown in monkey kidney cultures.
Question 3.
How was the first polio vaccine accepted?
Answer:
The first polio vaccine was subjected to clinical tests in the United States and parts of Canada on a massive scale. As it was successful, the Government promptly granted permission for the vaccine to be given away among the children.
Question 4.
What was the problem with the original Salk vaccine?
Answer:
The problem with the original Salk vaccine was that it brought 260 cases of polio including 10 deaths due to incomplete inactivation of some virus particles.
Question 5.
How was the Salk vaccine given?
Answer:
Salk vaccine was injected into the muscle in two medical doses, each at an interval of one month, and requires boosters every five years.
Question 6.
How is the Sabin vaccine given?
Answer:
Sabin vaccine is given in three doses in the first two years of life and a booster is given when the child starts school.
Question 7.
What are the advantages of an oral vaccine?
Answer:
The advantages of an oral vaccine are long-lasting immunity, the prevention of reinfection of the digestive system, and oral administration at a cheaper price.
Question 8.
What is its major disadvantage?
Answer:
Its major disadvantage is that it is not applicable to patients with weak immune systems, since it is a live virus that is likely to cause disease in these patients.
UNIT – V
Gist:
Despite the never-ending debate between safety and cost, it is fortunate for us to choose from two good alternatives. Both vaccines invented by Salk and Sabin, are accepted all over the world. The United States prefers the Sabin vaccine to the Salk one, but other countries like the former. Relentless research is carried out for the development of these vaccines. The development of more fruitful culturing and purification methods induces a higher level of antibody formation. The latest research in the development of the polio vaccine is to combine E. Coli’s genes with genes of poliovirus by which E. Coli can synthesize viral capsid proteins to be used in making a vaccine. Thanks to the invention and use of the polio vaccine, America was declared to be free from polio in 1994. The World Health Organization is also concerned about it. This unit ends on a positive note. Like smallpox complete eradication of poliomyelitis, the editors’ hope, is possible.
ସାରମର୍ମ :
ନିରାପତ୍ତା ଏବଂ ମୂଲ୍ୟ ମଧ୍ୟରେ ଚାଲିଥିବା ଅସରନ୍ତି ବିତର୍କ ସତ୍ତ୍ବେ, ଆମ୍ଭମାନଙ୍କର ସୌଭାଗ୍ୟ ଯେ ଆମେ ଦୁଇଟି ବିକଳ୍ପ ମଧ୍ୟରୁ ଗୋଟିଏକୁ ବାଛିପାରୁଛୁ । Salk ଏବଂ Sabinଙ୍କଦ୍ବାରା ଉଦ୍ଭାବନ ହୋଇଥିବା ଉଭୟ ପ୍ରତିଷେଧକ ପୃଥିବୀର ଚାରିଆଡ଼େ ବ୍ୟବହାର କରାଯାଉଛି । ଆମେରିକାରେ Salkଙ୍କ ପ୍ରତିଷେଧକ ଅପେକ୍ଷା Sabinଙ୍କ ପ୍ରତିଷେଧକର ଆଦର ବେଶୀ । କିନ୍ତୁ ଅନ୍ୟାନ୍ୟ ଦେଶରେ ପ୍ରଥମଟିକୁ ପସନ୍ଦ କରାଯାଉଛି । ଏଇ ଦୁଇଟି ପ୍ରତିଷେଧକର ଉନ୍ନତିକରଣ ପାଇଁ ଅବିଶ୍ରାନ୍ତ ଗବେଷଣା ଜାରି ରହିଛି । ଫଳପ୍ରଦ ପୋଷଣ ଓ ବିଶୋଧ ପଦ୍ଧତିର ଉନ୍ନତିକରଣ ଶରୀରରେ ଅଧିକ ମାତ୍ରାରେ ରୋଗ ପ୍ରତିରୋଧକ ଶକ୍ତି ସୃଷ୍ଟି କରିଥାଏ। ପୋଲିଓ ପ୍ରତିଷେଧକ ପ୍ରସ୍ତୁତିର ସର୍ବାଧୁନିକ ଗବେଷଣା ହେଉଛି E. Coliର ଜିକୁ ପୋଲିଓ ଭୂତାଣୁ ଜିନ୍ ସହିତ ମିଶ୍ରିତ କରିବା, ଯଦ୍ବାରା E. Coli ଭୂତାଣୁର ବାହ୍ୟ ପ୍ରୋଟିନ୍ ସ୍ତରକୁ ସଂଶ୍ଳେଷଣ କରିପାରିବ ଯାହାକି ପ୍ରତିଷେଧକ ପ୍ରସ୍ତୁତି ପାଇଁ ବ୍ୟବହୃତ ହୋଇପାରିବ । ପୋଲିଓ ପ୍ରତିଷେଧକ ଉଦ୍ଭାବନ ଓ ବ୍ୟବହାରଦ୍ୱାରା ୧୯୯୪ ମସିହାରେ ଆମେରିକା ପୋଲିଓମୁକ୍ତ ଭାବେ ଘୋଷିତ ହେଲା । ବିଶ୍ଵ ସ୍ବାସ୍ଥ୍ୟ ସଙ୍ଗଠନ ମଧ୍ଯ ଏ ଦିଗରେ ଉଦ୍ୟମରତ ରହିଛି । ଲେଖକ ଆଶା କରନ୍ତି ଯେ ବସନ୍ତ ଭଳି ପୋଲିଓର ସମ୍ପୂର୍ଣ ଦୂରୀକରଣ ସମ୍ଭବ ହେବ ।
Glossary:
debate : ବିତର୍କ
alternative : ବିକଳ୍ପ
currently : at present (ବର୍ତ୍ତମାନ୍)
preferred : ପସନ୍ଦ କରାଯାଇଛି
induce : produce (ସୃଷ୍ଟି କରେ)
exciting. : causing eagerness (ଆଗ୍ରହ ସୃଷ୍ଟିକାରୀ)
recombinant biotechiogy : an advanced process of vaccine production (ପ୍ରତିଷେଧକ ପ୍ରସ୍ତୁତିର ଉନ୍ନତ ପ୍ରକ୍ରିୟା)
genetic cloning: the process of producing similar populations of genetically identical individuals that occur in nature when organisms such as bacteria, insects, or plants reproduce asexually. (ଜିନୀୟ ପ୍ରତିରୂପ ସୃଷ୍ଟି ପ୍ରକ୍ରିୟା)
synthesis: a combination of components to form a connected whole (ସଂଶ୍ଳେଷଣ )
excluding: ବାଦ୍ ଦେଇ
content: ବିଷୟବସ୍ତୁ
rare: ବିରଳ
likely : possibly (ସମ୍ଭବତ)
its footsteps: the complete eradication of polio would follow the complete extinction of small-pox (ଏହାର ପଦଚିହ୍ନ)
Think it out:
Question 1.
What induces higher levels of antibody formation?
Answer:
The development of more fruitful culturing and purification techniques induces higher levels of antibody formation.
Question 2.
What is the latest research in the development of the polio vaccine?
Answer:
The latest research in the development of the polio vaccine is to combine E. Coli’s genes with genes of poliovirus by which E. Coli can synthesize viral capsid proteins to be used in making a vaccine.
Question 3.
Is complete eradication of poliomyelitis possible?
Answer:
Yes, it is possible. Complete eradication of smallpox is a case in point.
Post-Reading Activities:
Doing with words :
(A) Study the following sentence and note the verbs in it :
Paradoxically, when sanitation improved, infants were no longer exposed at an age when they were protected, so they did not develop antibodies to the viruses. There are four finite verbs – improved, were exposed, were protected, and did develop Note ‘improved’, and ‘did develop’ are in the active voice; ‘were exposed’ and ‘were protected’ are in the passive voice. In passive voice, the form of the verb is ‘be’ + pp verb: any form of the auxiliary verb ‘be’ + past participle form of the main verb – were + expose(d), were + protect(ed).
Identify the finite verbs in the following sentences and write which verbs are in active voice, and which are in passive voice.
(i) The virus enters the body by nose or mouth and travels to the intestines, where it incubates.
(ii) In most cases, this stops the progression of the virus; lifelong immunity against the disease is acquired.
(iii) Babies were frequently exposed to polioviruses.
(iv) These infants did not contract the disease because their mothers’ antibodies were passed on to them through breastfeeding.
(v) He developed a process using formalin, a chemical that inactivated the whole virus.
(vi) The Salk vaccine is given in two intramuscular injections spaced one month apart and requires boosters every 5 years.
(vii) The Sabin oral vaccine is given in three doses in the first two years of life, and a booster is given when the child starts school.
Answer:
(i) (a) enters, travels, incubates — finite verbs
(b) All verbs in active voice,
(ii) (a) stops – finite verb – active voice
(b) is acquired – finite verb – passive voice
(iii) (a) were exposed – finite verb – passive voice
(iv) (a) did not contract – finite verb – active voice,
(b) were passed – finite verb – passive voice
(v) (a) developed, inactivated – finite verbs – active voice
(vi) (a) is given – finite verb – passive voice
(b) requires – finite verb – active voice
(vii) is given – finite verb – passive voice
(b) starts – finite verb – active voice
(B) Fill in the blanks with the verbs given in brackets in active voice. Use simple past tense.
(i) Ramakrishna ______________(fascinate) him.
(ii) Wanderlust ______________ (seize) him.
(iii) He ______________(feel) the presence of an inward power.
(iv) He ______________ (decide) to take part in the Parliament of Religions.
(v) A friendly Maharaja ______________(give) him his passage.
(vi) He ______________ (address) the audience as ‘Sisters and Brothers of America’.
(vii) Hundreds ______________ (rise) and ______________(applaud).
(viii) He ______________(use) no written text, not even notes.
(ix) America’s outward glitter ______________ not (deceive) him.
(x) He ______________(preach) Hindu philosophy.
Answer:
(i) Ramakrishna fascinated him.
(ii) Wanderlust seized him.
(iii) He felt the presence of inward power.
(iv) He decided to take part in the Parliament of Religions.
(v) A friendly Maharaja gave him his passage.
(vi) He addressed the audience as ‘Sisters and Brothers of America’.
(vii) Hundreds rose and applauded.
(viii) He used no written text, not even notes.
(ix) America’s outward glitter did not deceive him.
(x) He preached Hindu philosophy.
(C) Fill in the blanks with the verbs given in brackets in passive voice. Use the simple present tense.
(i) Civilization ______________not (inherit).
(ii) It ______________(learn) and ; ______________(earn) by each generation anew.
(iii) If the transmission of Civilization ______________ (interrupt) for one century, civilization will die and we will be savage again.
(iv) Therefore, importance (give) to higher education in our country.
(v) Colleges ______________ (design) to meet the needs of higher education.
Answer:
(i) Civilization is not inherited.
(ii) It is learned and earned by each generation anew.
(iii) If the transmission of Civilization is interrupted for one century, civilization will die and we will be savage again.
(iv) Therefore, importance is given to higher education in our country.
(v) Colleges are designed to meet the needs of higher education.
CHSE Odisha Class 12 English Development of Polio Vaccines Important Questions and Answers
I. Multiple-Choice Questions (MCQs) with Answers
Question 1.
Polio broke out in America in —
(A) 1920
(B) 1921
(C) 1934
(D) 1923
Answer:
(B) 1921
Question 2.
Roosevelt fell prey to —
(A) influenza
(B) hunting
(C) polio
(D) none of these
Answer:
(C) polio
Question 3.
He was unfortunate, because —
(A) he suffered from polio for long
(B) his legs suffered lifelong paralysis
(C) his body ached for several days
(D) none of these
Answer:
(B) his legs suffered lifelong paralysis
Question 4.
The percentage of people affected by a paralytic form of polio is –
(A) 2
(B) 3
(C) 1
(D) none of these
Answer:
(C) 1
Question 5.
People showing symptoms of muscular paralysis can be —
(A) hopeful
(B) hopeless
(C) sadistic
(D) none of these
Answer:
(A) hopeful
Question 6.
Roosevelt’s political career was —
(A) ruined
(B) short-lived
(C) distinguished
(D) none of these
Answer:
(C) distinguished
Question 7.
Polio was not so deadly as –
(A) plague
(B) influenza
(C) both (A) and (B)
(D)none of these
Answer:
(C) both (A) and (B)
Question 8.
Through the first half of the century, the advancement of hygiene methods and knowledge has been –
(A) marginal
(B) fine
(C) phenomenal
(D) moderate
Answer:
(C) phenomenal
Question 9.
The word ‘cumbersome’ means –
(A) ordinary
(B) superficial
(C) systematic
(D) none of these
Answer:
(D) none of these
Question 10.
The lack of a vaccine for polio pushed parents throughout America to a state of –
(A) optimism
(B) fear
(C) great fear
(D) hopelessness
Answer:
(C) great fear
Question 11.
Vaccine developments for polio date back to –
(A) 1900s
(B) the early 1900s
(C) 1901
(D) none of these
Answer:
(B) the early 1900s
Question 12.
That immunity was primarily during infancy before the 1900s sounded –
(A) controversial
(B) tragic
(C) ironic
(D) all of these
Answer:
(C) ironic
Question 13
Which one of the following statements is false?
(A) Efforts at water treatments are modem.
(B) Polio is caused by three strains of stable viruses.
(C) In the early 1900s, researchers were alive of the existence of more than one polio vims.
(D) The March of Dimes was set up to conduct research on polio.
Answer:
(A) Efforts at water treatments are modem.
Question 14.
The March of Dimes came into existence, thanks to –
(A) a respected researcher
(B) a specialist
(C) Roosevelt
(D) none of these
Answer:
(C) Roosevelt
Question 15.
The word ‘founded’ means –
(A) set out
(B) foundation
(C) established
(D) structured
Answer:
(C) established
Question 16.
Which one of the following statements is true?
(A) Dr. Salk started his career as an immunologist.
(B) His research was of immense help in 1949, 1952, and 1954.
(C) Salk’s research on polio was not innovative,
(D) Salk vaccine was used in America without any deliberation.
Answer:
(A) Dr. Salk started his career as an immunologist.
Question 17.
Which one out of the following statements is false?
(A) A method of growing polio vims in cell culture was of immense help in 1949.
(B) Formalin was a chemical that made the whole virus work.
(C) Salk vaccine was put to clinical trials in the USA and parts of Canada in great measure.
(D) In 1957, Albert Brace emerged on the polio scene.
Answer:
(B) Formalin was a chemical that made the whole virus work.
Question 18.
1963 witnessed the availability of –
(A) Salk vaccine
(B) different vaccines for polio
(C) Brace vaccine
(D) none of these
Answer:
(C) Brace vaccine
Question 19.
The word ‘endemic’ means-
(A) contagious
(B) infected
(C) acute
(D) inimical
Answer:
(B) infected
Question 20.
The most appropriate title of this extract is –
(A) Research on Polio
(B) Cure for Polio
(C) Contributions of Salk and Bruce in the field of polio
(D) Polio, a deadly disease
Answer:
(C) Contributions of Salk and Bruce in the field of polio
Question 21.
Research continues to improve these vaccines. The underlined word means –
(A) three
(B) polio
(C) Sabin and Salk
(D)both (A) and (B)
Answer:
(C) Sabin and Salk
Question 22.
The word ‘Recombinant’ means –
(A) reorganized
(B) reconciliation
(C) remembrance
(D) none of these
Answer:
(C) remembrance
Question 23.
We are fortunate, because –
(A) Polio vaccination is plentily available.
(B) Polio is curable.
(C) We are left with a choice between the Sabin vaccine and the Salk vaccine.
(D) all of these
Answer:
(C) We are left with a choice between the Sabin vaccine and the Salk vaccine.
Question 24.
This is theoretically impossible. The underlined word means –
(A) treatment of polio
(B) poliovirus
(C) a goal of the complete elimination of polio from the whole world by 2000
(D) none of these
Answer:
(C) a goal of the complete elimination of polio from the whole world by 2000
Question 25.
The word ‘eradicated’ means –
(A) rooted out
(B) abdicated
(C) cleared out
(D) combat
Answer:
(A) rooted out
II. Short Type Questions with Answers
Question 1.
Why did early attempts at the polio vaccine fail and what do we now know?
Answer:
Early attempts of developing a polio vaccine failed as a result of the researchers’ total lack of knowledge about the existence of more than one virus. We now know that three strains of quite stable viruses that constitute a part of the enterovirus family, having RNA as their genetic material give rise to polio.
Question 2.
How can a polio vaccine be effective?
Answer:
A polio vaccine can be effective as a result of a vaccine’s power to confer immunity against all three strains of completely stable viruses.
Question 3.
What made it possible for infants to acquire immunity from polio?
Answer:
Infants acquired immunity from polio because of their mothers’ breastfeeding which created antibodies in them.
Question 4.
Did improved sanitation help to avoid polio attacks before the 1990s? Give a reasoned answer.
Answer:
It was an irony that immunity was primarily acquired during infancy before the 1990s as sanitation conditions were poor and efforts at sewage and water treatments were primitive.
Question 5.
Why was ‘polio’ a frightening, contagious disease?
Answer:
‘Polio’ was ‘a frightening, contagious disease’, because it affected all irrespective of poor and rich, assumed devastating proportions and it seemed impossible to hold it in check, despite strides in the field of medicine.
Question 6.
What did the first half of the 19th century witness?
Answer:
The first half of the 19th century witnessed great advancement in basic hygiene methods and knowledge.
Question 7.
What did people begin to expect for the first time in civilization?
Answer:
For the first time in civilization, people expected good health. They stopped merely hoping for it.
Question 8.
What happened in the early 1950s?
Answer:
In the early 1950s, there were shocking posters of children on crutches or iron lungs, the large and heavy mechanical aids to help those whose lungs would not function at all.
Question 9.
What light does the extract throw on Roosevelt?
Answer:
Roosevelt had a spectacular political career. He became the President of the United States of America. Above all, he was a relentless crusader against polio.
Question 10.
Throw light on one of the disadvantages of oral vaccines.
Answer:
One of the disadvantages of oral vaccine is that those in close touch with immunocompromised patients cannot use it because of the shedding of the live virus in the vaccine in the feces of those who inject it and the possible transmission to the immunocompromised patient.
Question 11.
How can polio spread?
Answer:
Polio can spread either through contact with infected feces or infected droplets traveling through the air, in food, or in water.
Question 12.
Why was it impossible at times to put polio in check despite advances in medicine?
Answer:
It was impossible at times to put polio in check despite advances in medicine because it was a deadly, highly contagious disease that ignored the rich and poor alike.
Question 13.
What made the people expect sound health instead of merely hoping for it?
Answer:
Advancements in basic hygienic methods and knowledge in the first half of the 19th century made people expect sound health instead of merely hoping for it.
Question 14.
“The writer takes us back to the early 1950s.” Why?
Answer:
The writer takes us back to the early 1950s because it was a witness to the stunning pictures of children on crutches or iron lungs, the large and heavy mechanical aids to help those whose lungs would never function.
Introducing the Author:
Bonnie A. Maybury Okonek is an American microbilogist. He is also a fiction writer. His writings are marked by their clarity and lucidity.
About the Topic:
The piece ‘Development of Polio Vaccines’ acquaints the readers with poliomyelitis or polio,- an acute, viral, and infectious disease. This deadly disease can give rise to paralysis or death. Its story goes back to 1921. Franklin D. Roosevelt, the 32nd President of the United States spearheaded the fight against it. The researchers in the early 1900s tried their best to find out a vaccine for polio. Dr. Jonas Salk and Albert Bruce Sabin immensely contributed to its development. The days are not far off when polio can be rooted out like smallpox.
Summary:
It was 1921. America fell prey to polio. A young politician Franklin Delano Roosevelt was unable to withstand this deadly disease. The virus spread very fast and ultimately his legs were paralyzed. The early symptoms of a polio attack are headache, nausea, vomiting, and fever. The carriers of poliovirus are air, food, or water. One percent of people attacked by it actually suffers from severe polio. The writer throws light on two forms of polio: spinal and bulbar. Muscle pain, stiff neck and back, and possible paralysis characterize both forms.
The former affects the patient’s limbs and the latter the lungs. Polio at its worst has no treatment. The symptoms of both forms of polio are similar and of the two, the bulbar form is more dangerous. The writer dwells upon the role of Roosevelt in spearheading the fight against polio. He was keen on not allowing this terrible disease to conquer him. His distinguished political career as the President of the United States continued for a long. He tried his best to increase public awareness of the dangerous disease and promote research.
Children are the most vulnerable to polio. Driven by panic parents, in the early 1950s, were afraid of sending their children to schools. They desperately waited for a vaccine. The early 1900s witnessed vaccine developments for polio. Some baffling observations were made by the researchers at that time in their attempt to find out a vaccine for polio. Ironically, some children were immune to polio before the 1900s because of poor sanitary conditions and primitive efforts to deal with sewage and water treatments.
Above all mothers, breastfeeding played a crucial role. In spite of improvements in sanitation, exposure to the virus in later childhood and adulthood made them run the risk of contracting polio. The March of Dimes set up by Franklin D. Roosevelt was a foundation that worked for the elimination of polio with the services of a venerable researcher. The writer acquaints us with Dr. Jonas Salk who started her medical research career embarking on the scientific study of protection against polio.
He used a method of growing poliovirus in cell culture to develop a polio vaccine. He developed a successful vaccine using a combination of the three types of virus grown in monkey kidney cultures. In 1952, he was the first to do so in this field. Then he developed a process using formalin, a chemical that deprived the whole virus of being active. Dr. Salk’s invention gave rise to the testing of the vaccine in clinical trials in the U.S.A. and parts of Canada in great measure. The scope of the trials was unprecedented in the history of medical science.
The results were spectacular. In 1955, the government immediately agreed to distribute vaccines to the children of the United States. But the problem with the Salk vaccine was that it brought 260 cases of polio including 10 deaths. It was sorted out at once. The Salk vaccine was given in intramuscular injections in a span of one month. In 1957, Albert Bruce Sabin emerged on the scene. He started testing a live, oral form of vaccine as a result of which the infectious part of the virus was rendered inactive.
The writer brings out the advantages of an oral vaccine. They are long-lasting immunity, the prevention of reinfection of the digestive system, and oral administration of the vaccine at a cheaper cost. Its major disadvantage is that it is not applicable to patients with weak immune systems, since it is a live virus that is likely to cause disease in these patients. It is not conducive to those in close contact with patients who are incapable of defending against illness. Sabin’s oral vaccine is not good for enterovirus-infected patients.
But there is no denying the fact that both vaccines have their merits and demerits concerning relative safety and cost. The writer states that both vaccines are now used all over the world. The United States prefers the Sabin vaccine to the Salk one. Research is still going on improving these vaccines. There has been development in effective culturing and purification techniques paving the way for vaccines to induce higher levels of antibody formation.
The latest research in the development of the polio vaccine is to combine E. Coli’s genes with genes of poliovirus by which E. Coli can synthesize viral capsid proteins to be used in making a vaccine. The invention and use of the polio vaccine have resulted in the elimination of polio in America. In 1988, the World Health Organization set a target of eradicating polio from the whole world by 2000. The essay ends on a positive note. In the writer’s view, polio could be rooted in smallpox.
୧୯୨୧ ମସିହାର କଥା। ଆମେରିକା ପୋଲିଓ ବ୍ୟାଧର ଶିକାର ହୋଇଗଲା । Franklin Delano Roosevelt ନାମକ ଜଣେ ଯୁବ ରାଜନୀତିଜ୍ଞ ଏହି ଭୟଙ୍କର ରୋଗକୁ ପ୍ରତିରୋଧ କରିବାକୁ ସମର୍ଥ ହୋଇ ନଥିଲେ । ଭୂତାଣୁ ବହୁ ଶୀଘ୍ର ବ୍ୟାପିଗଲା ଏବଂ ଶେଷରେ ତାଙ୍କର ଗୋଡ଼ଦ୍ବୟ ଅଞ୍ଚଳ ହୋଇଗଲା । ପୋଲିଓ ସଂକ୍ରମଣର ପୂର୍ବ ଲକ୍ଷଣଗୁଡ଼ିକ ହେଉଛି ମୁଣ୍ଡବ୍ୟଥା, ଅସ୍ଵସ୍ଥିବୋଧ, ବାନ୍ତି ଏବଂ ଜ୍ଵର । ବାୟୁ, ଖାଦ୍ୟ କିମ୍ବା ଜଳ ହେଉଛି ପୋଲିଓ ଭୂତାଣୁର ବାହକ । ପ୍ରକୃତରେ ପୋଲିଓଦ୍ଵାରା ଆକ୍ରାନ୍ତମାନଙ୍କ ମଧ୍ୟରୁ ଏକ ପ୍ରତିଶତ ରୋଗୀ ମାରାତ୍ମକ ପୋଲିଓ ବ୍ୟାଶ୍ରେ ପୀଡ଼ିତ ହୁଅନ୍ତି । ଲେଖକ ଦୁଇ ପ୍ରକାର ପୋଲିଓ ଉପରେ ଆଲୋକପାତ କରିଛନ୍ତି; ଯଥା – spinal (ମେରୁଦଣ୍ଡ ସମ୍ବନ୍ଧୀୟ) ଏବଂ bulbar (ଫୁସ୍ଫୁସ୍ ସଂକ୍ରାନ୍ତୀୟ) ।
ମାଂସପେଶୀ ଯନ୍ତ୍ରଣା, ବେକ ଓ ପିଠି ଲାଠି ହୋଇଯିବା ଏବଂ ସମ୍ଭାବ୍ୟ ପକ୍ଷାଘାତ ଦୁଇ ପ୍ରକାର ପୋଲିଓର ଲକ୍ଷଣ । ପ୍ରଥମଟି ରୋଗୀର ଅଙ୍ଗପ୍ରତ୍ୟଙ୍ଗକୁ ଆକ୍ରାନ୍ତ କରୁଥିବାବେଳେ ଦ୍ୱିତୀୟଟି ଫୁସ୍ଫୁସ୍କୁ ଆକ୍ରାନ୍ତ କରେ । ଉଭୟ ପ୍ରକାର ପୋଲିଓର ଲକ୍ଷଣ ସମାନ ଏବଂ ଦୁଇଟି ମଧ୍ୟରୁ ଫୁସ୍ଫୁସ୍ ସଂକ୍ରାନ୍ତୀୟ (bulbar) ପୋଲିଓ ବେଶୀ ଭୟଙ୍କର । ପୋଲିଓ ବିରୁଦ୍ଧରେ ରୁଜ୍ଭେଲ୍ଙ୍କ ଲଢ଼େଇକୁ ଆଗେଇ ନେବାର ଭୂମିକା ସମ୍ବନ୍ଧରେ ଲେଖକ କହିଛନ୍ତି । ଏହି ଭୟଙ୍କର ବ୍ୟାଡ୍ ତାଙ୍କୁ ପରାଜିତ କରିନପାରୁ ବୋଲି ସେ ବଦ୍ଧପରିକର ଥିଲେ । ଯୁକ୍ତରାଷ୍ଟ୍ର ଆମେରିକାର ରାଷ୍ଟ୍ରପତିରୂପେ ତାଙ୍କର ସ୍ୱନାମଧନ୍ୟ ରାଜନୈତିକ ଜୀବନ ବହୁଦିନ ପାଇଁ ତିଷ୍ଠି ରହିଲା । ଏହି ମାରାତ୍ମକ ରୋଗ ସମ୍ବନ୍ଧରେ ଜନସଚେତନତା ସୃଷ୍ଟି କରିବା ଓ ଗବେଷଣାକୁ ପ୍ରୋତ୍ସାହନ ଦେବା ନିମନ୍ତେ ସେ ଯତ୍ପରୋନାସ୍ତି ଉଦ୍ୟମ କରିଥିଲେ ।
ପିଲାମାନେ ପୋଲିଓର ଶିକାର ହେବାର ସମ୍ଭାବନା ସବୁଠୁ ଅଧିକ । ୧୯୫୦ ଦଶକର ପ୍ରାରମ୍ଭରେ ଆତଙ୍କଗ୍ରସ୍ତ ପିତାମାତାମାନେ ସେମାନଙ୍କ ପିଲାମାନଙ୍କୁ ବିଦ୍ୟାଳୟକୁ ପଠାଇବାକୁ ଭୟ କରୁଥିଲେ । ଊନବିଂଶ ଶତାବ୍ଦୀର ଆଦ୍ୟଭାଗରେ ପୋଲିଓ ପ୍ରତିଷେଧକ ଉଦ୍ଭାବନ ପାଇଁ ଉଦ୍ୟମ ଆରମ୍ଭ ହେଲା । ପୋଲିଓର ପ୍ରତିଷେଧକଟିଏ ପାଇବାପାଇଁ ଗବେଷକମାନେ କେତେକ ଦ୍ୱାତ୍ମକ ପର୍ଯ୍ୟବେକ୍ଷଣର ଆଶ୍ରୟ ନେଇଥିଲେ । ରହସ୍ୟଜନକଭାବେ ଉନବିଂଶ ଶତାବ୍ଦୀ ପୂର୍ବରୁ କେତେକ ପିଲା ପୋଲିଓ ସଂକ୍ରମଣରୁ ମୁକ୍ତ ଥିଲେ । ସର୍ବୋପରି ମାତୃ ସ୍ତନ୍ୟପାନର ଭୂମିକା ଏ ଦିଗରେ ଗୁରୁତ୍ଵ ଭୂମିକା ନିର୍ବାହ କରୁଥିଲା । ପରିମଳ ବ୍ୟବସ୍ଥାର ଉନ୍ନତି ସତ୍ତ୍ଵେ ପରବର୍ତ୍ତୀ ବାଲ୍ୟାବସ୍ଥା ଏବଂ ବୟସ୍କାବସ୍ଥାରେ ସେମାନେ ପୋଲିଓ ଭୂତାଣୁ ସଂସର୍ଗରେ ଆସିଲେ ପୋଲିଓ ବ୍ୟାଧଗ୍ରସ୍ତ ହେବାର ବିପଦ ରହୁଥିଲା ।
ଫ୍ରାଙ୍କଲିନ୍ ରୁଜ୍ଭେଲ୍ସଙ୍କଦ୍ଵାରା ସ୍ଥାପିତ The March of Dimes ଯାହାକି ଜଣେ ସମ୍ମାନନୀୟ ଗବେଷକଙ୍କଦ୍ବାରା ପୋଲିଓ ବ୍ୟାଧ୍ୟାକୁ ସମ୍ପୂର୍ଣ୍ଣରୂପେ ମୂଳୋତ୍ପାଟନ ନିମନ୍ତେ କାର୍ଯ୍ୟରତ ଥିବା ଏକ ଅନୁଷ୍ଠାନ ଥିଲା । ଲେଖକ Dr. Jonas Salkଙ୍କ ସହିତ ଆମକୁ ପରିଚିତ କରାଇଛନ୍ତି ଯିଏକି ପୋଲିଓରୁ ରକ୍ଷା ପାଇଁ ବିଜ୍ଞାନସମ୍ମତ ଗବେଷଣା କରି ଚିକିତ୍ସକର ଜୀବନ ଆରମ୍ଭ କରିଥିଲେ । ସେ ପୋଲିଓ ପ୍ରତିଷେଧକ ପ୍ରସ୍ତୁତି ପାଇଁ କୋଷୀୟ ପୋଷଣ ଜରିଆରେ ପୋଲିଓ ଭୂତାଣୁ ବଢ଼ାଇବାର ଏକ ପଦ୍ଧତି ବ୍ୟବହାର କରିଥିଲେ । ମାଙ୍କଡ଼ର ବୃକ୍କରେ ପୋଷିତ ହେଉଥିବା ତିନିପ୍ରକାର ଭୂତାଣୁର ମିଶ୍ରଣରେ ଏକ ଫଳପ୍ରଦ ପ୍ରତିଷେଧକ ପ୍ରସ୍ତୁତ କରିଥିଲେ ।
୧୯୫୨ ମସିହାରେ ସେ ଏ କ୍ଷେତ୍ରରେ ପ୍ରଥମ ଥିଲେ । ତା’ପରେ ସେ ଫରମାଲିନ୍ ନାମକ ଏକ ରାସାୟନିକ ପଦାର୍ଥ ବ୍ୟବହାର କରିଥିଲେ ଯାହାକି ସମସ୍ତ ଭୂତାଣୁଙ୍କୁ କାର୍ଯ୍ୟକ୍ଷମ ହେବାରୁ ବଞ୍ଚିତ କରୁଥିଲା । ଡକ୍ଟର Salkଙ୍କର ଉଦ୍ଭାବନ ଯୁକ୍ତରାଷ୍ଟ୍ର ଆମେରିକା ଓ କାନାଡ଼ାର କେତେକ ଅଞ୍ଚଳରେ ଚିକିତ୍ସା କ୍ଷେତ୍ରରେ ପରୀକ୍ଷଣ ନିମନ୍ତେ ବହୁଳ ଭାବେ ପ୍ରୟୋଗ ହୋଇଥିଲା । ଏହି ପ୍ରୟୋଗର ଫଳାଫଳ ଚିକିତ୍ସାବିଜ୍ଞାନର ଇତିହାସରେ ଅଭୂତପୂର୍ବ ଥିଲା ଫଳାଫଳ ଚମତ୍କାର ଥିଲା । ଆମେରିକାର ପିଲାମାନଙ୍କୁ ଏହି ପ୍ରତିଷେଧକ ବାଣ୍ଟିବାପାଇଁ ସରକାର ତତ୍କ୍ଷଣାତ୍ ରାଜି ହେଇଗଲେ । କିନ୍ତୁ Saikଙ୍କ ପ୍ରତିଷେଧକର ସମସ୍ୟା ଥିଲା ଯେ ଏହାଦ୍ଵାରା ୧୦ ଜଣଙ୍କର ମୃତ୍ୟୁ ସହିତ ୨୬୦ ଜଣ ରୋଗଗ୍ରସ୍ତ ହେବାର ଜଣାପଡ଼ିଲା । ଏହି ସମସ୍ୟାର ଆଶୁ ସମାଧାନ କରାଯାଇଥିଲା ।
Saikଙ୍କ ପ୍ରତିଷେଧକ ଟୀକା ଆକାରରେ ଏକ ମାସ ସମୟ ବ୍ୟବଧାନରେ ମାଂସପେଶୀ ମଧ୍ଯରେ ଦିଆଯାଉଥିଲା । ୧୯୫୭ ମସିହାରେ ଦୃଶ୍ୟପଟ୍ଟରେ Albert Bruce Sabinଙ୍କର ଆବିର୍ଭାବ ହେଲା । ସେ ଏକପ୍ରକାର ଜୀବନ୍ତ ଓ ପାଟିରେ ଖିଆଯାଇ ପାରୁଥିବା ପ୍ରତିଷେଧକ ଉପରେ ପରୀକ୍ଷଣ ଚଳାଇଲେ ଯାହାକି ଭୂତାଣୁର ସଂକ୍ରମିତ ଅଂଶକୁ ନିଷ୍କ୍ରିୟ କରିଦେଉଥ୍ଲା । ଲେଖକ ପାଟିରେ ଖିଆଯାଉଥିବା ବୁନ୍ଦାର ଉପକାରିତା ବିଷୟରେ ବର୍ଣ୍ଣନା କରିଛନ୍ତି । ସେଗୁଡ଼ିକ ହେଲା – ଦୀର୍ଘ ପ୍ରତିଷେଧକ ଶକ୍ତି, ପରିପାକ ତନ୍ତ୍ରରେ ପୁନଃସଂକ୍ରମଣର ନିରାକରଣ, ପାଟିରେ ଖୁଆଇବା କାରଣରୁ କମ୍ ଖର୍ଚ୍ଚାନ୍ତ ହେବା । ଏହାର ମୁଖ୍ୟ ଅପକାରିତା ହେଲା ଦୁର୍ବଳ ପ୍ରତିରୋଧ ଶକ୍ତିସମ୍ପନ୍ନ ପିଲାମାନଙ୍କ କ୍ଷେତ୍ରରେ ଏହାକ ପ୍ରୟୋଗ କରାଯାଇପାରିବ ନାହିଁ, କାରଣ ଏହା ଏକ ଜୀବନ୍ତ ଭୂତାଣୁ ହୋଇଥିବାରୁ ସେମାନଙ୍କଠାରେ ରୋଗ ସୃଷ୍ଟି କରିବାର ଯଥେଷ୍ଟ ସମ୍ଭାବନା ରହିଛି ।
ପୋଲିଓ ବ୍ୟାଧ୍ୟାକୁ ପ୍ରତିରୋଧ କରିପାରୁନଥିବା ରୋଗୀମାନଙ୍କ ସଂସ୍ପର୍ଶରେ ଆସୁଥିବା ବ୍ୟକ୍ତିବିଶେଷଙ୍କ ଏହା ଲାଭପ୍ରଦ ନୁହେଁ । ଅନ୍ତନଳୀରେ ଭୂତାଣୁ ସଂକ୍ରମିତ ରୋଗୀମାନଙ୍କ ନିମନ୍ତେ Sabinଙ୍କ ପାଟିରେ ଖିଆଯାଉଥିବା ପ୍ରତିଷେଧକ ଲାଭଦାୟକ ନୁହେଁ । ଆପେକ୍ଷିକ ନିରାପତ୍ତା ଓ ଖର୍ଚ୍ଚ ଦୃଷ୍ଟିରୁ ଉଭୟ ପ୍ରକାର ପ୍ରତିଷେଧକର ଭଲ ଓ ମନ୍ଦ ଗୁଣ ଯେ ରହିଛି ଏହା ନିଃସନ୍ଦେହରେ କୁହାଯାଇପାରେ । ଲେଖକ କହିଛନ୍ତି ଯେ ବର୍ତ୍ତମାନ ଉଭୟ ପ୍ରକାର ପ୍ରତିଷେଧକ ପୃଥିବୀରେ ସର୍ବତ୍ର ବ୍ୟବହାର କରାଯାଉଛି । ଯୁକ୍ତରାଷ୍ଟ୍ର ଆମେରିକାରେ Salkଙ୍କ ପ୍ରତିଷେଧକ ପରିବର୍ତ୍ତେ Sabinଙ୍କ ପ୍ରତିଷେଧକ ବ୍ୟବହାରକୁ ପସନ୍ଦ କରାଯାଇଛି । ପ୍ରତିଷେଧକର ଉନ୍ନତିକରଣ ନିମନ୍ତେ ଅନୁସନ୍ଧାନ ଜାରି ରହିଛି । ଫଳପ୍ରଦ ପୋଷଣ ଓ ବିଶୋଧନ କୌଶଳର ଉନ୍ନତି କରାଯାଇପାରିଛି ଯାହାକି ପ୍ରତିଷେଧକକୁ ଶରୀରରେ ରୋଗ ପ୍ରତିରୋଧକ ଶକ୍ତି ସୃଷ୍ଟି କରିପାରୁଛି ।
ପୋଲିଓ ପ୍ରତିଷେଧକ ପ୍ରସ୍ତୁତିର ସର୍ବାଧୁନିକ ଗବେଷଣା ହେଉଛି E. Coli ଜିକୁ ପୋଲିଓ ଭୂତାଣୁର ଜିନ୍ ସହିତ ମିଶ୍ରିତ କରିବା, ଯଦ୍ବାରା E. Coli ଭୂତାଣୁର ବାହ୍ୟ ପ୍ରୋଟିନ୍ ସ୍ତରକୁ ସଂଶ୍ଳେଷଣ କରିପାରିବ ଯାହାକି ପ୍ରତିଷେଧକ ପ୍ରସ୍ତୁତି ପାଇଁ ବ୍ୟବହୃତ ହୋଇପାରିବ । ପୋଲିଓ ପ୍ରତିଷେଧକର ଉଦ୍ଭାବନ ଏବଂ ବ୍ୟବହାର ଫଳରେ ଆମେରିକରୁ ପୋଲିଓର ମୂଳୋତ୍ପାଟନ ହୋଇପାରିଛି । ୧୯୮୮ ମସିହାରେ ବିଶ୍ଵ ସ୍ବାସ୍ଥ୍ୟ ସଙ୍ଗଠନ ପକ୍ଷରୁ ୨୦୦୦ ମସିହା ସୁଦ୍ଧା ସମଗ୍ର ବିଶ୍ଵରୁ ପୋଲିଓର ମୂଳୋତ୍ପାଟନ ପାଇଁ ଲକ୍ଷ୍ୟ ରଖୁଥିଲା । ସକାରାତ୍ମକ ଭାବଧାରାକୁ ନେଇ ପ୍ରବନ୍ଧର ପରିସମାପ୍ତି ଘଟିଛି । ଲେଖକଙ୍କ ମତରେ ବସନ୍ତ ଭଳି ପୋଲିଓର ମୂଳୋତ୍ପାଟନ କରାଯାଇପାରିବ ।