NPR's "Shots" blog reports on efforts to determine the source of Haiti's cholera epidemic, writing, "Most researchers currently believe that United Nations peacekeeping soldiers introduced cholera to Haiti in October of 2010," but researchers from the University of Maryland report they "have found two very different cholera strains in some of the first Haitians to be struck by the disease." According to the blog, "One is a so-called 01 serotype with close resemblance to the Nepalese strain, found in about half the patients sampled," while "[t]he other is a type called non-01/O139 that has never been known to cause an epidemic; it was found in 21 percent of patients."