HIV Strain (Group O)

Rare HIV Strain Found for First Time in U.S.

Published in Medical Letter on the CDC and FDA, July 15th, 1996

A rare, strain of HIV often missed by existing blood tests has been found in the United States for the first time, U.S. health officials said.

An unidentified African woman in Los Angeles County, California, is one of fewer than 100 people worldwide known to have been infected with the strain, called HIV-1 group O, the U.S. Centers for Disease Control and Prevention (CDC) said. All other strains of HIV-1 have belonged to group M, the CDC said.

Existing blood tests detect the group O virus only some of the time, because it is genetically different. "Some of the tests that are currently available for HIV don't consistently detect infection with group...

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