Among the following,  how many vaccines have killed pathogens?                         

 B.C.G., Pertussis, Pneumonia, Rabies, TAB vaccine, Influenza.

• 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'.