Antivaxxers do not do immunology too well:
Indeed A pair of crocs..
…let alone have an answer for it.
http://podiapaedia.org/wiki/research/pseudoscience/logical-fallacies/shill-gambit/
http://podiapaedia.org/wiki/research/pseudoscience/logical-fallacies/ad-hominem/
Look at what sort of low lifes that they are: http://www.soapboxsunday.com/boy-the-ant-vaxxer-have-gone-to-a-new-low/
It used for warts too.