1 doctor weighed in:

Is it possible for a toddler to get whooping cough if he's been immunized?

1 doctor weighed in
Dr. Holly Maes
Pediatrics

In brief: It's rare-

But not impossible.
The vaccine is 96-99 % effective, but that still means 1 or 2 in 100 may not build up good antibody levels. If there is concern he has pertussis, cultures can be done. If the concern is did he build up immunity, then a blood test can be done to see if he is indeed immune. That test is not cheap, but if significant concern, then is warranted.

In brief: It's rare-

But not impossible.
The vaccine is 96-99 % effective, but that still means 1 or 2 in 100 may not build up good antibody levels. If there is concern he has pertussis, cultures can be done. If the concern is did he build up immunity, then a blood test can be done to see if he is indeed immune. That test is not cheap, but if significant concern, then is warranted.
Dr. Holly Maes
Dr. Holly Maes
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