I had done homosexual relation with a partner and his sperm spread from lower portion of my penis to stooldoor. And my penis was covered with condom. After 50 days I have tested HIV at ICTC Clinic and reports negative. After 55 days from exposure I have tested HIV P24 Antigen and reports negative. After 120 from exposure I have tested HIV at ICTC and reports negative. Any chances of HIV infections?
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The p24 antigen assay measures the viral capsid (core) p24 protein in blood that is detectable earlier than HIV antibody during acute infection. It occurs early after infection due tothe initial burst of virus replication and is associated with high levels of viremia during which the individual is highly infectious.(1) When antibodies to HIV become detectable, however, p24 antigen is often no longer demonstrable, most likely due to antigen-antibody complexing in the blood. When detected, p24 antigen is highly specific for infection. The specificity of the p24 antigen test in detecting HIV infection using PCR as the gold standard was calculated from data using test kits from 2 manufacturers to be 99.9%.(2) In the same study, the sensitivity following a procedure of neutralization to confirm the presence of p24 antigen was 100%.
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