Human herpesvirus 8 can be transmitted through blood in drug addicts.

Human Herpes virus type-8 (HHV-8) seroprevalence was studied in a population of HIV positive intravenous drug users (IVDUs) from Argentina. Analysis of this population also indirectly made it possible to study HHV-8 blood transmission, because these individuals frequently engage in needle sharing behavior and are capable of acquiring a broad array of blood borne pathogens, including Hepatitis B/C virus. The seroprevalence of HHV-8 in IVDUs was compared to a group of non-IVDUs and HIV negative individuals. Of the 223 individuals tested, 13.45% were HHV-8 positive, 16.99% in the IVDUs group, and 5.71% in the non-IVDUs. Among HIV positive IVDUs, 25/144 (17.36%) were also HHV-8 seropositive. The seropositivity rate of HHV-8 in HIV negative IVDUs was 11.1%. In contrast, HHV-8 seroprevalence in HIV negative heterosexual individuals without drug usage behavior was even lower (5.71%). The rate of HHV-8 infection in HIV positive IVDUs was three times as high compared to the non IVDU HIV negative individuals, suggesting that IVDU is a risk for HHV-8 infection. Furthermore, it was found that IVDUs showed a very high rate of Hepatitis B/C (52.77%), which also correlate with HHV-8 infection in this population (23.68%). All Hepatitis B/C positive individuals were also HIV positive. Our data confirm other studies showing that individuals who share needles are at risk for acquiring Hepatitis B/C and HIV infections. In addition, our results suggest that they are also at risk to acquiring HHV-8 infection by the same route.

Human herpesvirus 8 can be transmitted through blood in drug addicts.

Human Herpes virus type-8 (HHV-8) seroprevalence was studied in a population of HIV positive intravenous drug users (IVDUs) from Argentina. Analysis of this population also indirectly made it possible to study HHV-8 blood transmission, because these individuals frequently engage in needle sharing behavior and are capable of acquiring a broad array of blood borne pathogens, including Hepatitis B/C virus. The seroprevalence of HHV-8 in IVDUs was compared to a group of non-IVDUs and HIV negative individuals. Of the 223 individuals tested, 13.45

were HHV-8 positive, 16.99

in the IVDUs group, and 5.71

in the non-IVDUs. Among HIV positive IVDUs, 25/144 (17.36

) were also HHV-8 seropositive. The seropositivity rate of HHV-8 in HIV negative IVDUs was 11.1

. In contrast, HHV-8 seroprevalence in HIV negative heterosexual individuals without drug usage behavior was even lower (5.71

). The rate of HHV-8 infection in HIV positive IVDUs was three times as high compared to the non IVDU HIV negative individuals, suggesting that IVDU is a risk for HHV-8 infection. Furthermore, it was found that IVDUs showed a very high rate of Hepatitis B/C (52.77

), which also correlate with HHV-8 infection in this population (23.68

). All Hepatitis B/C positive individuals were also HIV positive. Our data confirm other studies showing that individuals who share needles are at risk for acquiring Hepatitis B/C and HIV infections. In addition, our results suggest that they are also at risk to acquiring HHV-8 infection by the same route.

Human herpesvirus 8 as a potential sexually transmitted agent in Honduras.

The seroprevalence of human herpesvirus 8 (HHV-8) was studied in 326 human immunodeficiency virus (HIV)-positive and -negative persons from Honduras; women constituted 77% (n = 251) of the subjects. Sera were tested for lytic HHV-8 antibodies by an IFA, and positive samples were confirmed by a radioimmunoprecipitation assay. Of the 326 persons tested, 58 (17.8%) had HHV-8 antibodies. Among the HIV-infected women, 22.7% were seropositive; 11.3% of the HIV-negative women were seropositive. HHV-8 seroprevalence was almost four times higher in HIV-positive female commercial sex workers (36%) than in HIV-negative female non-commercial sex workers (9.9%; odds ratio = 3.8, 95% confidence interval = 1.1-13; P = 0.01), suggesting that commercial sex work is a risk factor for HHV-8 infection. In the men studied, the overall HHV-8 seroprevalence was 22.6%, with a seropositivity rate of 28% for HIV-positive men compared with 12% for HIV-negative men.

The human immunodeficiency virus tat gene enhances replication of human herpesvirus-6.

Human herpesvirus-6 (HHV-6) can enhance the cytopathic effects of human immunodeficiency virus type 1 (HIV-1) in cells doubly infected by HIV-1 and HHV-6. HHV-6 enhances transcription of the HIV-1 long terminal repeat, and several HHV-6 trans-activator genes have been identified. Since HIV-1 and HHV-6 have similar cellular tropism, and since HIV-1 trans-activates other herpesviruses, a reciprocal interaction between the two viruses is possible. Interactions between HIV-1 and HHV-6 were analyzed in human umbilical cord blood (CB) lymphocytes and in a T-cell line by transfection and infection experiments. CB cells dually infected with HIV-1 and HHV-6 showed an increase in HHV-6 infectious titer, an increase in HHV-6-specific immediate early RNA, and an increase in HHV-6 protein synthesis. Similarly, T-lymphocyte cells transfected with the entire HIV-1 proviral genome displayed an increase in HHV-6. When T-cells were transfected with a plasmid containing the HIV-1 tat gene under control of the simian virus (SV40) promoter and infected with HHV-6, higher levels of HHV-6 proteins and infectious virus were detected. Therefore, the presence of HIV-1 gene products, such as tat, can lead to an activation of HHV-6 expression. Since HHV-6 is cytopathic, its activation by HIV-1 may accelerate the depletion of CD4+ T-cells in infected individuals.