Abstract
Cerebrospinal fluid (CSF) specimens from 63 patients with different severities of human immunodeficiency virus (HIV-1) infection, including asymptomatic virus carriers, were examined for the presence of HIV-1 by using polymerase chain reaction (PCR) and virus isolation. Polyadenylated RNA, presumably associated with virus particles, was extracted and reverse transcribed, and the pol region was amplified in a nested PCR. Virus could be detected in 90% of the CSF specimens examined by PCR, and data on isolation of virus from CSF were in agreement with these figures. In fact, when several CSF specimens from the same individual were studied, HIV-1 could be isolated from 80% of the patients. The presence of the viral RNA in CSF was independent of the clinical stage of infection and of neurological symptoms. These results show that the spread of HIV-1 to the brain represents an early event during infection and occurs in the majority of asymptomatic individuals.
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Selected References
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