Medicine: HIV developments

As reported in this month's issue of JAMA, there is some indication that routine circumicision of all African men "could prevent 2 million new HIV infections and avert 300,000 deaths over the next 10 years". Why could this be? Well, Australian researchers have discovered that Langerhans cells on the inner surface of foreskin have a thinner keratin layer that may be more susceptible to the virus.