The BCG vaccine contains live bacteria that have been weakened (attenuated).
Killed (inactivated) vaccines are made from a protein or other small pieces taken from a virus or bacteria. Whooping cough (pertussis) vaccine is an example.
Pneumococcal vaccine is inactivated or "killed" vaccines and does not contain any live organisms.
The rabies vaccine is made from the killed rabies virus.
TAB vaccines and some influenza vaccines are live attenuated vaccines.
But some influenza vaccines are inactivated as well.
So the correct option is 'four'.
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Q1
Among the following, how many vaccines have killed pathogens?