Polio? Maybe not yet, but "vaccine resistance" isn't the same thing as antibacterial resistance. Antibiotic resistance is generally created through contact with

Polio? Maybe not yet, but "vaccine resistance" isn't the same thing as antibacterial resistance. Antibiotic resistance is generally created through contact with the antibiotic but stuff like polio, measles, mumps, and rubella just need an unvaccinated host coming into contact with vaccinated people long enough. Once the unvaccinated host's disease mutates enough (and it never stops mutating), it will start jumping to vaccinated hosts whose immune systems no longer recognize the threat as one it has prepared for by the vaccine [1][2]. [1] http://www.nejm.org/doi/full/10.1056/NEJMoa060775 http://www.nejm.org/doi/full/10.1056/NEJMoa060775 [2] http://www.sciencedirect.com/science/article/pii/S0264410X02006278 http://www.sciencedirect.com/science/article/pii/S0264410X02...