© 1994 Oxford University Press
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Demographic Factors Associated with HTLV-1 Infection in a Gabonese Community



* INSERM U13 et Fondation Léon M'ba, Hôpital Claude Bernard Paris, France
** CIRMF, Franceville, Gabon
OCEAC, Yaoundé, Cameroun
Service des Grandes Endérnies, Franceville, Gabon
Reprint requests to: B Larouzé, INSERM U13/1MEA, 190 boulevard Mac Donald, 75019, Paris, France
An epidemiological study of human T-lymphotropic virus type 1 (HTLV-1) and syphilis has been carried out in a multiethnic community of seven neighbouring villages located in eastern Gabon on 1240 subjects over 5 years old (82.7% of the population in this age range). Antibodies to HTLV-1 (anti-HTLV-1) were detected by ELISA with confirmation by Westem Blot and antibodies to syphilis by Venereal Diseases Research Laboratory assay with confirmation by the Treponema pallidum haemaglutination assay. The prevalence rate of anti-HTLV-1 was 8.5% and increased from 3.7% in the 514 years age group to 23.8% in the over 60 years age group. Logistic regression showed that the positivity for anti-HTLV-1 was associated with age, ethnic group and sex (higher prevalence in females). The seroprevalence rate of syphilis was 8.2%. Seropositivity for syphilis and HTLV-1 were related but age was a confounding variable in this relationship. This study showing a highly heterogenous distribution of HTLV-1 in a geographically limited area suggests the role of environmental and behavioural factors in HTLV-1 transmission.
Received 1 February 1994