Reports of HIV 'Superinfection' Increase

PARIS - Evidence is growing that "superinfection" with more than one strain of HIV (news - web sites) may be more common than previously thought, which could complicate efforts to make a vaccine, experts said Monday at an international AIDS (news - web sites) conference.

Scientists reported three new cases of HIV-infected people who initially were doing well without drugs but became sick years later after contracting a second strain of the AIDS virus.

"Superinfection is sobering," said Dr. Anthony Fauci, director of the National Institute of Allergy and Infectious Diseases (news - web sites), the chief U.S. AIDS research agency. He was not involved in the studies.

"That means that although you can mount an adequate response against one virus, the body still does not have the capability to protect you against new infection, which tells you that the development of a vaccine is going to be even more of a challenge."

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