<prompt> Salk vaccine is a:Live vaccineLive attenuated vaccineKilled vaccineToxoid  <response>: c. Killed vaccineRef: IAP Guidebook on Immunization 2013-14; pg 113-117, Nelsons 20e p 3212, Ghai, 8e p 190- 191Polio vaccines were developed in the USA during 1950, first the inactivated polio vaccine IPV by Jonas Salk and later the live oral polio vaccine OPV by Albert Sabin. Remember: Salk is a killed vaccine. 