[Epidemiology of infections caused by HIV-1, HIV-2 and HTLV-1 in the republic of Chad]. / Epidémiologie des infections à rétrovirus VIH1-VIH2 et HTLV1 en Republique du Tchad.

From March to July 1989 sero-epidemiological surveys have been carried out in four Chadian towns on representative samples of adults aged 15-44 years in the general population. For the first time, HIV1 virus circulation was shown off with seroprevalence rates varying from 0 to 1.1%. Rates are non-existent for HIV2 and they vary from 0 to 1.6% for HTLV1. These low seroprevalence rates make it difficult to identify special risk factors. There was confirmed a preponderance of heterosexual transmissions of these viruses.

[Epidemiological aspects of human African trypanosomiasis in south Chad]. / Aspects épidémiologiques de la trypanosomiase humaine africaine dans le sud du Tchad.

The authors are recording results of a clinical, parasitological and immunological sample survey about african human trypanosomiasis in the South Chad where old focus has been reexplored. In 1988 the situation ever remains as a problem in some areas (Tapol, Ranga) where high prevalence rates are found again.