The Sabin polio vaccine is ________ , whereas the Salk vaccine is _____________.
live and attenuated; heat killed and inactivated
The Sabin polio vaccine is live and attenuated, whereas the Salk vaccine is heat killed and inactivated. The Salk polio vaccine is produced by formaldehyde inactivation of the
poliovirus. Sabin vaccine may cause vaccine associated paralysis and may revert to virulence but in only very rare cases.