When you fuck bareback, you're fucking Hitler.
Attack of the 50 foot ho-bag
More for your delectation can be found here.
The Scientist had an interesting article about the connection between disease outbreaks and "extreme" religious practice. It's not freely available, but I'll do a little extracting and expanding. The article had additional joyful discussions of cholera and rubella, but I'll just focus on polio outbreaks:
1978-1979: An outbreak in the Netherlands spreads to the US and Canada, brought by members of the Reformed Netherlands Congregation, which refuses vaccinations.
1992: Polio strikes the Netherlands again in "a strict Calvinist church that rejects vaccination against disease."
2004: The Nigerian state of Kano refused to take part in a UN campaign to vaccinate children. "Islamic clerics alleged that the vaccine had been filled with hormones as part of a US-led plot to sterilize African girls." The result? By September 2005, Nigeria is home to more than half of the cases of polio in the world and the Nigerian polio strain has spread to 11 other formerly polio-free countries (including Indonesia) with close to a thousand cases of paralysis.
2005: The first homegrown polio case in the US since 1979 is found among the Amish.
Now to be sure, there have been other outbreaks, presumably not related to religion at all. But none in the first world as far as I can tell.