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What is the purpose of p24 antigen for the test and how long the test will be performed after infection?


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replied July 26th, 2018
HIV and AIDS Answer A64194
As per CDC recommendations, the only test used to screen for HIV is the ELISA test, which detects HIV antibodies in the body secretions and or blood. The 4th generation ELISA tests for HIV, detects both the HIV antibody as well as antigens of HIV (P24 Antigen) virus. Hence the test that is very accurate and sensitive at detecting HIV infection. This test can be done after 4 weeks of exposure. If found negative, the test should repeat it every 4 weeks until 12 weeks.

In case the test results are negative after 12 weeks (as in your case), then you can consider yourself as HIV free.


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