https://www.instagram.com/johntravolta/
Doctors claim that it is to prevent pertussis, then why not just give a pertussis shot. Also, there are 2 different combination vaccines. I know that dtap is the one given to babies. Not sure which one is the 4 year old booster. Also after my kid got the 5th shot at 5 years old he he kept getting a cold atleast once a month for months.