Lack of detection of human immunodeficiency virus in persistently seronegative homosexual men with high or medium risks for infection. 
Some studies have suggested that seronegative homosexual men who have practiced high-risk sexual behavior can carry the human immunodeficiency virus (HIV) in a silent state, detectable only by polymerase chain reaction (PCR) or selective viral culture.  To assess this concept, blood specimens were studied from 59 homosexual men with recognized risk behaviors: unprotected anal receptive intercourse at least once and many lifetime sex partners.  After extensive virologic studies and PCR analysis, only one virus-positive, antibody-negative individual was identified.  These findings indicate that HIV virus-positive, seronegative individuals are rare.