Originally Posted by mamakay
It does both.
Doctors misdiagnose even "classic" pertussis in vaxed kids all the time, and the vax can also make the symptoms milder. Also, pertussis is fairly mild in about 30% of unvaxed kids, too. So doctors just don't want to diagnose pertussis, period, unless they see something that looks "really, really bad and scary" which isn't always, or even ususally what happens.
Thanks mamakay and spero - that's...