<prompt> p24 antigen disappears from the blood after how many weeks in HIV -2-4 weeks4-6 weeks6-8 weeks8-10 weeks  <response>: Ans. is c i.e., 6-8 week . Low level of circulating HIV-1 p24 antigen can be detected in the plasma by EIA soon after infection. . The antigen often becomes undetectable after antibodies develop 6-12 weeks following infection. . p-24 antigen reappear late in the course of infection indicating a poor prognosis. 