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In the United States, a substantial proportion of HIV transmissions among men who have sex with men (MSM) arise from main sex partners. Couples voluntary HIV testing and counseling (CHTC) is used in many parts of the world with male–female couples, but CHTC has historically not been available in the U.S. and few data exist about the extent of HIV serodiscordance among U.S. male couples. We tested...
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