<prompt> The protective value of vaccine is 95. It meansAll those vaccinated are protected5 among 100 have the probability of getting infected after vaccinationAmong those vaccinated, 95 persons are not susceptible to the injections95 of persons do not get the disease, where as 5 get the disease  <response>: Vaccine is an immuno-biological substance designed to produce specific protection against a given diseaseIt stimulates the production of protective antibody and other immune mechanismsVaccines can be prepared from live modified organisms, inactivated or killed organisms, extracted cellular fractions, toxoids or combination of theseVaccine efficacy is the percentage reduction of disease in a vaccinated group of people compared to an unvaccinated group, using the most favorable conditionsVaccine efficacy was designed and calculated by Greenwood and Yule in 1915 for cholera and typhoid vaccinesIt is best measured using double-blind, randomized, clinical controlled trials, such that it is studied under best case scenarios 