I got in a fight with a woman at church today. She's a school nurse, and in general a very stubborn woman. I walked away -- I'm not skilled in confrontation. But she was loudly complaining about how the current pertussis epidemic is the fault of the unvaccinated. When I pointed out that all of the children from the local day care who came down with pertussis were fully vaccinated, she started going on and on about passive immunity, and that everyone needs to be vaxed for it to work (maybe she was confusing herd immunity?) She then told me that it was most definitely NOT the fault of vaccines that my son has PDD. She's never met him and doesn't know his story, so at this point I walked away.
If you have a good layman's article on passive immunity, or you want to try to explain it to me yourself, I'd appreciate it. Thanks.