A patient comes to hospital with a history of sore throat, diarrhoea and sexual contact 2 weeks before. The best investigation to rule out HIV is -: (A) P24 antigen assay, (B) ELISA, (C) Western blot, (D) Lymphnode biopsy
Answer is A. following a single massive imfection the p24Ag is the earliest marker appear in blood REF:MICROBIOLOGY ANANTHA NARAYANAN NINTH EDITION PAGE.577