Scientists have been examining transmission of a virus from monkeys to humans in Bangladesh, one of the world's most densely populated countries. The scientists have found that some people in urban Bangladesh are concurrently infected with multiple strains of simian foamy virus, including strains from more than one source (recombinant) -- and call for more surveillance to prevent another outbreak like HIV.

Source: Simian foamy viruses readily occur between humans and macaques in urban Bangladesh