"“I first spoke about metzitzah b’peh when I ran in 2005,” Mr. Weiner said at the Brooklyn forum, referring to the ritual where a mohel
uses his mouth to suck blood from the circumcision wound. The city’s
health department has linked the practice to several fatal transmissions
of the herpes virus to infants, and now requires mohels to obtain letters of consent from parents that make them explicitly aware of the ritual’s health risks." (thanks Ali)