This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Microbiology
p24 antigen disappears from the blood after how many weeks in HIV - 
Select and explain. 
A. 2-4 weeks, B. 4-6 weeks, C. 6-8 weeks, D. 8-10 weeks
C: 6-8 weeks
Answer: C: 6-8 weeks 
Explanation: 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.