© 1999 by Oxford University Press
Journal of the National Cancer Institute, Vol. 91, No. 5, 465-469,
March 3, 1999
© 1999 Oxford University Press
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High Seroprevalence of Antibodies to Human Herpesvirus-8 in Egyptian Children: Evidence of Nonsexual Transmission
Affiliations of authors: M. Andreoni, E. Nicastri, L. Ventura, L. Ercoli, L. Sarmati, G. Rocchi, Infectious Diseases Institute, University of "Tor Vergata," Rome, Italy; G. El-Sawaf, University of Alexandria, Egypt; G. Rezza, Centro Operativo AIDS, Istituto Superiore di Sanità, Rome; B. Ensoli, Laboratory of Virology, Istituto Superiore di Sanità, Rome.
Correspondence to: Massimo Andreoni, M.D., Department of Public Health and Cellular Biology, University "Tor Vergata," Via di Tor Vergata 135, 00133 Rome, Italy (e-mail: andreoni{at}uniroma2.it).
BACKGROUND: In western countries, human herpesvirus-8 (HHV-8) appears to be transmitted mainly by sexual contact. To evaluate the role of other transmission routes, especially in developing countries, we estimated the seroprevalence of HHV-8 in Egyptian children, who, if seropositive, would have acquired the virus through a nonsexual route. METHODS:Sera from 196 children (<1-12 years of age), 20 adolescents (13-20 years of age), and 30 young adults (21-25 years of age) attending a vaccination program in Alexandria, Egypt, were studied. Immunofluorescence assays were used to detect antibodies against HHV-8 lytic-phase antigens (anti-lytic) and latent-phase antigens (anti-latent). Antibodies against Epstein-Barr virus viral cap antigen, cytomegalovirus, and HHV-6 were detected by enzyme-linked immunosorbent assays. Seroprevalence of these herpesviruses was calculated after stratifying the subjects by age. RESULTS: Anti-lytic and anti-latent HHV-8 antibodies were detected in 44.7% and 8.5% of the study participants, respectively. The prevalence of anti-lytic antibodies tended to increase with age, exceeding 50% in children older than 6 years; once children reached the age of 10 years, the prevalence tended to stabilize. The seroprevalence of other herpesviruses tended to be higher than that of HHV-8, ranging from approximately 83% to more than 97% in the 9- to 12-year age group. One- to 3-year-old children had higher titers of anti-lytic HHV-8 antibodies than children in the other age groups. Anti-latent antibodies were more frequently detected in individuals with high anti-lytic antibody titers. CONCLUSIONS: HHV-8 antibodies are highly prevalent in Egyptian children, suggesting that, in developing countries, HHV-8 infection may be acquired early in life through routes other than sexual transmission. The lower seroprevalence of HHV-8 relative to that of the other herpesviruses suggests that HHV-8 is less transmissible than other common herpesviruses.
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