Post exposure prophylaxis is given in A/E

Ans. is 'c' i.e., Pertussis Active immunoprophylaxis after exposure to disease is recommended for:RabiesTetanusHepatitisMeasles (within three days of exposure)*VaricellaMeasles 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).