<prompt> Vaccine with highest efficacy -MeaslesDPTOral typhoidTetanus  <response>: 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 - 