In two cases there was simultaneous or sequential occurrence of amebiasis, shigellosis, and giardiasis in male homosexuals. Enteric pathogens may, under the proper conditions, be venereally transmitted. In particular, the sexual practices of male homosexuals, most significantly, oral-anal contact, appear to provide the necessary link for transmission. Evidence suggests that this is a growing problem.
(JAMA 238:1387-1389, 1977)