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Updated: Jul 26, 2026

Peptide-based Identification of Functional Motifs and their Binding Partners
Published on: June 30, 2013
Clinical, immunologic, and serologic findings in men at risk for acquired immunodeficiency syndrome. The San
Insights
Nearly half of homosexual/bisexual men studied had human immunodeficiency virus (HIV) antibodies. Clinical signs, excluding lymphadenopathy, correlated with immune impairment in HIV-positive individuals.
Area of Science:
- Epidemiology
- Immunology
- Public Health
Background:
- The human immunodeficiency virus (HIV) epidemic disproportionately affected men who have sex with men.
- Understanding the prevalence and clinical indicators of HIV infection in specific populations is crucial for public health interventions.
Purpose of the Study:
- To determine the prevalence of HIV infection among homosexual and bisexual men in San Francisco.
- To identify clinical signs and laboratory markers associated with HIV infection and immune impairment.
Main Methods:
- A population-based probability sample of 1034 single men in San Francisco was recruited.
- Participants underwent serological testing for HIV antibodies.
- Clinical examinations and laboratory tests, including T cell subset analysis and skin test reactivity, were performed.
Main Results:
- Forty-nine percent of homosexual/bisexual men tested positive for HIV antibodies; all heterosexual men were negative.
- Among seropositive men, 29% had marked lymphadenopathy, and 16% presented with at least two other HIV-suggestive symptoms.
- Presence of multiple clinical signs (excluding lymphadenopathy) correlated with HIV infection, reduced skin test reactivity, and lower Leu 3a T helper cell counts.
Conclusions:
- HIV infection was highly prevalent in this San Francisco cohort of homosexual/bisexual men.
- Clinical manifestations, in conjunction with immunological markers like T cell counts, are important indicators of HIV infection and immune status.
- Lymphadenopathy alone was not a reliable indicator of the severity of immune impairment.
Abstract:
Forty-nine percent of homosexual/bisexual men were positive for antibody to the human immunodeficiency virus (HIV) in a population-based probability sample of 1034 single men recruited from San Francisco. All heterosexual men were negative. Among seropositive men, marked lymphadenopathy was present in 29%, and 16% had at least two other symptoms or signs suggestive of HIV infection. However, lymphadenopathy alone failed to indicate severity of immune impairment. The occurrence of two or more clinical signs and symptoms, except for marked lymphadenopathy, correlated with HIV infection, diminished skin test reactivity, and reduction in Leu 3a T cells. Twenty-nine percent of seropositive men had fewer than 400 absolute Leu 3a T helper cells per microliter (less than 0.4 X 10(9)/L). Seronegative homosexual/bisexual men did not differ from heterosexual men in any clinical or laboratory variables except for increased numbers of suppressor Leu 2a T suppressor cells per microliter.
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