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Human sera from Lodwar (77 sera), Nzoia (841 sera), Masinga (251 sera), Laisamis (174 sera) and the Malindi/Kilifi area (556 sera) in Kenya were tested by indirect immunofluorescence for antibodies against Marburg, Ebola (Zaire and Sudan strains), Congo haemorrhagic fever, Rift Valley fever and Lassa viruses. Antibodies against Ebola virus, particularly the Zaire strain, were detected in all regions and were, over-all, more abundant than antibodies against the other antigens. Ebola and Marburg antibody prevalence rates were highest in the samples from Lodwar and Laisamis, both semi-desert areas. Antibodies against Rift Valley fever virus were also highest in the Lodwar sample followed by Malindi/Kilifi and Laisamis. Congo haemorrhagic fever virus antibodies were rare and no antibodies against Lassa virus were detected in the 1899 sera tested.

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