DESCRIPTIVE STUDY DURING RIFT-VALLEY FEVER EPIDEMIC IN MAURITANIA-TRARZA DISTRICT IN 1987

Randomized epidemiological studies conducted inside the Rift Valley fever epidemic area permitted an estimate of the different epidemiological rates. For the town of Rosso, the total number of infected persons was estimated at 9 320, the total number of symptomatic diseases at 1 013 and the number of deaths at 47. The minimal number of deaths for the area which had access to the hospital was 232. The immunity rate in the town was 34,89 % after the epidemic. The ELISA test was used to test human and animal IgG and IgM antibodies. Human samples were collected using the << confetti >> technique. After the epizootic the incidence was 36,9 % and the immunity was 70,06 % for animals sampled in the town.