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High Seroprevalence of Human Herpesvirus 8 Infection in HIV-positive Homosexual Men in Jiangsu Province, China.

BACKGROUND
HIV-infected homosexual men are more frequently diagnosed with Kaposi's sarcoma. With the increase of HIV-infected homosexual men in China, we urgently need to know the KS-related human herpesvirus (KSHV/HHV-8) seroprevalence in this population. To investigate HHV-8 prevalence among HIV-positive homosexual men, we recruited 183 patients naive of antiretroviral therapy (ART) whose blood samples presented with HIV-antibody positive as confirmed by western blot.


METHODS
HIV viral load was tested using Cobas TaqMan HIV-1 test Version 2.0, and CD4 T cell counts were tested using a Flow cytometry instrument. All HIV-positive blood samples were collected and screened for KSHV. Immunofluorescence (IFA) test was conducted for HHV-8-Specific antibodies (anti-LANA) in the plasma. HHV-8 DNA in whole blood cells of IFA-positive subjects was quantified with Real-time polymerase chain reaction (RT-PCR).


RESULTS
All samples showed HIV RNA positive. CD4+ T cell count was 23% cases (42/183) which showed ≤200 cells/μL, 51.3% cases (94/183) showed 201-500 cells/μL and 25.7% cases (47/183) showed ≥501 cells/μL. Immunofluorescence (IFA) test demonstrated an HHV-8 prevalence of 50.8% (93/183), among which 20.4% of the cases (19/93) were HHV-8 DNA positive. HHV-8 infection showed no difference among different age groups (p=0.96). Similarly, HHV-8 infection exhibited no significant difference among different HIV viral load groups (p=0.08). However, HHV-8 infection among different CD4+ T cell count showed significant difference (P=0.0004).


CONCLUSION
This study showed a high seroprevalence of human herpesvirus 8 infection in HIVpositive homosexual men.