Question

The following vaccine trial was performed: 1,000 randomly selected children 2 years of age were given a vaccine against a certain disease and followed for 10 years. Of these, 80% were never afficted with the disease. Which is the most correct conclusion regarding the efficacy of the vaccine?

A. No conclusion is possible because no follow-up was made of nonvaccinated children.

B. The vaccine is an excellent one because of the high rate of immunization

C. The vaccine is not very effective because it should have produced a higher immunization rate

D. No conclusion is possible because no test of statistical significance was performed

E. The significant figure is 100%-80% = 20%, the rate of acquiring the illness.

???

Answer 1

Anawer : B) vaccine is excellent one because of high immunisation rate .

First , no vaccine is 100% effective to make vaccines safer than the disease ,the bacteria or virus is killed or attenuated .for reasons related to individual such as health status ,life style ,environment ,susceptibility etc ,not all vaccinated persons develop immunity against that particular disease. most routine child hood vaccines are effective 80- 90 % of recipient .