I was more concerned with the tetanus and the diphtheria... as whooping cough is not something that worries me.. HOWEVER, the vaccine is a combination anyway.. What I didn't realize is that whooping cough can spread from an unvaccinated grandparent to infants and it can be deadly.. So while that is not a problem for me as my grandchildren are older, it is still good to know for those in contact with babies under 12 months.