Our expert says:
Dear SA perspective
In South Africa we use the 3 month timeline as a rule, the safest is to do the Westernblot as well as the Elisa test as each on their own may have false neg or positives. The reason for the 3 months is because it can take from 6 weeks up to 12 months for your body to make enough antibodies against the virus to be detected in the blood by the antibody tests (but usually by 3 months most people have enough antibodies). The rapid test is just a screening test and should not be used as a confirmation of HIV infection or not. More sensitive tests will be the PCR or viral load test, which actually test for the virus and not like the Elisa/WB, for antibodies against the virus in the blood, but this is usually not used for diagnosing of HIV, rather for monitoring the baseline infection.
Read the part under diagnosis on this webpage: http://www.niaid.nih.gov/factsheets/hivinf.htm
If someone has a high risk of infection ( contact with blood or full intercourse) we normally ask them to repeat the test at 6 months. In your case I don't think it is necessary, but will probably give you peace of mind.
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