CP3S said:

Pertussis is an extremely serious upper respiratory infection and is highly contagious, and worst of all, it can have permanent debilitating effects on your child. We don't typically get pertussis or often hear about it... because thanks to modern science (wooo!) we have vaccinations against it. We don't live in the middle ages anymore, there really is no reason to leave your child unprotected and vulnerable.

And Pertussis (aka whooping cough aka 100 Day Cough) is making a comeback due to parents not getting their kids vaccinated and adults not keeping up with their boosters.