Under Jewish law, a mohel must draw blood from the circumcision wound. Most mohels do it by hand with a suction device, but some follow the traditional practice of doing it by mouth. The Centers for Disease Control and Prevention issued a warning in 2012 about the health implications of the latter practice, citing 11 cases of neonatal Herpes simplex virus (HSV) and two recorded fatalities. A 2013 review of cases of neonatal HSV infections in Israel identified ritual circumcision as the source of HSV-1 transmission in 31.8% of the cases.