Why do Israeliโs suck off Jewish infants and spread herpes and kill them? Jewish circumcisers (mohelim) do a practice called metzitzah b'peh. Metzitzah b'peh is when the mohel uses their mouth to suck blood away from the baby's circumcision. metzitzah b'peh can put babies at risk of getting a harmful virus called herpes simplex virus type 1 or HSV-1. Some of these babies became seriously ill. Some developed brain damage, and others have died.