In 1982-1983, were reported the cases of haemorrhagic fevers among populations living in the Madina-Ula district of Guinea. Clinico-epidemiological and serological studies (experimental studies) reveal into presumption of Ebola and Lassa fever viruses significance in the etiology of the disease outbreaks. Antibodies to Ebola virus were recognized in 19% from total number of sweating reconvalescent patients with the same clinical features, in order to 8% in healthy local populations. Antibodies to Lassa virus were detected in 3 cases, in 4 cases was revealed Lassa virus antigen in small rodents.
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