Which among the following is a killed vaccine: (A) Japanese encephalitis, (B) Measles, (C) Influenza vaccine, (D) Yellow fever
Answer is A. Japanese encephalitis vaccine is a killed vaccine Killed vaccines are produced by growing virus or bacteria in a culture media and then inactivating them with heat or chemicals They are usually safe but less efficacious than live attenuated vaccines. Measles, yellow fever and influenza vaccines are live attenuated vaccines Ref : Park&;s Textbook of Preventive and Social Medicine; 23rd edition