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this is the offical updated CDC guidelines

Single Possible or Known Exposure

Most infected persons will develop detectable HIV antibody within 3 months of exposure (126). If the initial negative HIV test was conducted within the first 3 months after exposure, repeat testing should be considered >3 months after the exposure occurred to account for the possibility of a false-negative result. If the follow-up test is nonreactive, the client is likely not HIV-infected. However, if the client was exposed to a known HIV-infected person or if provider or client concern remains, a second repeat test might be considered >6 months from the exposure. Rare cases of seroconversion 6--12 months after known exposure have been reported (134). Extended follow-up testing beyond 6 months after exposure to account for possible delayed seroconversion is not generally recommended and should be based on clinical judgment and individual clients needs
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Avatar universal
This is not a guideline...have you read it? "a second repeat test might be considered" Did the word 'might' change to 'must'?

The CDC says that the majority of people will test positive between 4-6 weeks. I think that it is somewhere in the neighboorhood of over 90% will. But 3 months is still the standard.
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