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  • Title: Changes in Rift Valley fever neutralizing antibody prevalence among small domestic ruminants following the 1987 outbreak in the Senegal River basin.
    Author: Thiongane Y, Gonzalez JP, Fati A, Akakpo JA.
    Journal: Res Virol; 1991; 142(1):67-70. PubMed ID: 2052753.
    Abstract:
    Following the Rift Valley fever (RVF) epizootic of 1987 in the Senegal River basin, 2 series of serosurveys were carried out. In 1988 and 1989, respectively, 303 and 331 randomly selected sheep and goats were investigated and sera tested for the presence of specific RVF-virus-neutralizing antibodies. In 1988, 24.4% of the sera was found to have anti-RVF neutralizing antibodies and in 1989, 19.3% was found. In 1988, we observed in the Dagana district, including the 1987 epizootic area, a significantly higher prevalence (71.1%) than in the two other more distant districts of Podor (21.5%) and Matam (9.7%). From 1988 to 1989, the antibody seroprevalence dropped significantly from 71.7 to 23.9% within the Dagana district. Young animals showed a significantly lower antibody prevalence (7.9%, N = 114) than adults (25.3%, N = 217). RVF virus circulated at a low level in 1988-89 without any epizootic manifestation. The population turnover generated an important non-immune population potentially at risk.
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