HIV resistant. Three strange cases have been described of patients infected with HIV in whom the virus has not continued to replicate after stopping treatment. The first was described in 1999, and is known as the “Berlin patient”. Now, a further two cases have been reported, the “Mississippi baby” and another in Massachusetts, also called the “Berlin patient”. The latter was described in 2008 and unlike the “first Berlin patient”, whose identity remains unknown, this patient’s is known (New England Journal of Medicine 370; 682-683, 2014).