New HIV test shows exposure earlier than infection-based tests.
D015492:AIDS Serodiagnosis / Q000379:methods*; D000163:Acquired Immunodeficiency Syndrome / Q000097:blood / Q000175:diagnosis*; D006801:Humans; D016133:Polymerase Chain Reaction; D006377:T-Lymphocytes, Helper-Inducer; D013997:Time Factors