Here we go - it's another strain one can still be colonized by, not pertussis, but parapertussis: http://www.cidd.psu.edu/research/synopses/acellular-vaccine-en

Here we go - it's another strain one can still be colonized by, not pertussis, but parapertussis: http://www.cidd.psu.edu/research/synopses/acellular-vaccine-enhancement-b.-parapertussis http://www.cidd.psu.edu/research/synopses/acellular-vaccine-... ("An acellular whooping cough vaccine actually enhances the colonization of Bordetella parapertussis in mice; pointing towards a rise in B. parapertussis incidence resulting from acellular vaccination, which may have contributed to the observed increase in whooping cough over the last decade.") tl;dr: "We missed a spot." Which is going to happen. I don't think it validates being anti-every-vaccine, but it does validate asking questions and furthering research (and ceasing the vilification of the population that does ask questions!).