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Studies of the in vivo efficacy of N-9 have shown that N-9 reduces the risk of HIV transmission in some cases but not in others. Condoms are therefore recommended as an important HIV prevention measure. For services worldwide, please use AIDSmap's e-atlas. Other risks of receptive oral-genital sex include small probabilities of human papillomavirus and hepatitis C transmission. Permeability to Viruses Several laboratory experiments were conducted to test the ability of latex condoms to provide an effective physical barrier against HIV.


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