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Female-to-female transmission of human immunodeficiency virus.

We describe a case of female-to-female transmission of human immunodeficiency virus (HIV). A 20-year-old African American woman with no obvious risk factors received a diagnosis of HIV infection, and the genotype of the infecting strain closely matched that of the strain infecting her openly bisexual female partner. The route of transmission was probably use of sex toys, used vigorously enough to cause exchange of blood-tinged body fluids.