2007-03-16 03:18:08 · 4 answers · asked by sandy 1 in Science & Mathematics ➔ Medicine
Polio Vaccination is given to babies at tenderstage. In vaccination they use very minute quantity of same virus. As the quantity is very small, the baby starts developing immunity. As this polio vaccine is offered at tender age it is not safe to offer the full dosage in dose. Hence they offer at three stages.
2007-03-16 03:32:08 · answer #1 · answered by Wiser 2 · 0⤊ 0⤋
One dose is not sufficient to give permanent immunity. Repeat doses cause increased antibody production by 'memory' response. In endemic areas, 3 doses are not enough. Now, they feel that 10 to 14 doses are required for complete protection. Hence, they have Polio Days when all children under the age of 5 years are given polio vaccine.
2007-03-16 13:41:56 · answer #2 · answered by yakkydoc 6 · 0⤊ 0⤋
Even three doses does not have 100 percent seroconversion or in common man's language do not offer 100 percent protection what to say of single dose. Second and third doses act as booster over the first dose.
2007-03-16 15:22:12 · answer #3 · answered by dubey 1 · 0⤊ 0⤋
Your body has to build up an immunity by creating antibodies.
It is just like Hepititis B shots. You have to have a series of 3 or it is not effective. Your body does not build up enough antibodies to be affective against that disease.
2007-03-16 10:26:10 · answer #4 · answered by Bubbles 2 · 0⤊ 0⤋