50% of new HIV infections flow from primary infection, likely limits effectiveness of prevention technologies
A recent study out of Quebec appears to indicate that up to half of all new HIV infections flow from individuals with primary infection.
Primary infection is defined as the first few weeks and months after infection when viral loads are highest in the infected individual. Antiretroviral medications typically reduce viral load to an undetectable level. "Treatment experienced" individuals, those who are on medications and doing well, do not efficiently transmit the virus through sexual activity. (HIV is not an efficiently transmissible disease, anyway. In anal intercourse, which is generally considered more risky than vaginal intercourse, the transmission event occurs in 6 out of every 10,000 acts for insertive partners, i.e. men, and 82 out of every 10,000 acts for receptive partners, i.e. women or men. Source: Ask InSite, UCSF.)
The researchers conclude:
... that despite recent advances in prevention technologies, such as circumcision or treating sexually transmitted infections “these strategies may be of limited effectiveness if individuals at or near to [primary HIV infection] represent a major source of onward transmission, because many such interventions depend on an initial positive diagnosis.”
Clearly, testing at or near the time of primary infection represents the best intervention in preventing transmission. Obviously, it is difficult to do. Hence, "normalizing" HIV testing in the health care system would likely answer the question of how to reach individuals early in their infection. A spotty health care system such as Africa has - and unfortunately among the poor in the United States - would seem to be one of the greatest obstacles to normalizing prevention efforts, especially testing.
Circumcision has been offered as an answer to "getting ahead of the curve" in transmission of this disease. However, it seems clear that getting ahead of the curve is far more dependent on knowing in whom and where infection is occurring rather than throwing a wide net over everyone, such as mass circumcision would seem to do. For the millions who are not at a high risk for HIV, circumcision offers nothing except known risks and physical, sexual, and financial costs.
Note: The article is not primarily about how this finding impacts on the debate over the implementation of male circumcision.
Aidsmap story after the jump.



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