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Although the risk for HIV transmission through oral sex is difficult to quantify (in large part because the mode of transmission in any given case can be difficult to establish), published studies suggest that the risk associated with fellatio is low, but not zero (see AIDS 1998;12:2095-105; 7th Conference on Retroviruses and Opportunistic Infections, Abstract 473; and AIDS 2000;16:2350-2352). Investigators in Sydney conducted detailed interviews with 75 acutely infected gay men between 1993 and 1999 to assess all risk behavior in the 6 months preceding seroconversion and to determine the likely mode of transmission.
The researchers established the most likely mode of transmission by sorting exposures according to a risk hierarchy: high risk…