Vaccine with highest efficacy -

Ans. is 'a' i.e., Measles Amongst the given options only measles vaccine induce effective immunity after a single dose. o Efficacy of measles vaccine is 95% after a single dose. o All others require multiple doses. o Efficacy of DPT vaccine is around 70%. o 3 years efficacy of three doses of oral typhoid vaccine is 50-60%. o In most clinical trials efficacy of tetanus has ranged from 80-100% - www.whom.tht.