<prompt> Post exposure prophylaxis is given in AERabiesMeaslesPertusisHepatitis B  <response>: Ans. is c i.e., Pertussis Active immunoprophylaxis after exposure to disease is recommended for:RabiesTetanusHepatitisMeasles within three days of exposureVaricellaMeasles vaccine can be given post exposure within three days of exposure because incubation period of measles is 7 days when the respiratory tract is bypassed as with vaccine which is given subcutaneously whereas normal incubation period is 10 days from exposure to onset of fever and 14 days to appearance of rash. 