 New infections among men who have sex with men (MSMs) grew rapidly thereafter, representing 26% of all new cases in 2014, up from 2.5% in 2006.Another major, non-sexual channel of infection was the Plasma Economy of the 1990s, wherein large numbers of blood donors, primarily in poor, rural areas, were infected with HIV as a result of systematically dangerous practices by state and private blood collection clinics.HIV evolved from the simian immunodeficiency virus (SIV), present in numerous species of primates in West Africa and Central Africa, in the early 20th century.