After exposure, the HIV PCR may become positive within 8 -10 days at the earliest. Certainly by a couple weeks to a month a negative test is good evidence agianst HIV infection.
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The current antibody test ( ELISA ) is generally positive by 1 month. But we do a follow up at 3 months to increase the sensitivity- although almost all that will be positive already are at 1 month.
The PCR is positive much earlier.
You are mixing up 2 different tests.