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  • Title: Rift Valley fever surveillance in mobile sheep flocks in the Nile Delta.
    Author: Allam IH, Feinsod FM, Scott RM, Peters CJ, Saah AJ, Ghaffar SA, el Said S, Darwish MA.
    Journal: Am J Trop Med Hyg; 1986 Sep; 35(5):1055-60. PubMed ID: 3766852.
    Abstract:
    Rift Valley fever (RVF) surveillance was carried out in the Nile Delta by monitoring mobile and stationary sheep flocks for antibodies to RVF virus. Sheep are known to be susceptible to RVF virus infection and experienced severe morbidity in 1977 and 1978 when RVF was epidemic in Egypt. Four hundred six sheep in 32 flocks were surveyed during 1984. Twenty-four sheep from 7 flocks had antibodies to RVF virus detected by hemagglutination inhibition and plaque reduction neutralization tests. Antibodies were found primarily in sheep greater than 3 years of age, although 1- and 2-year-old sheep were included in the sample. No seroconversion was observed among 177 seronegative sheep that were bled successively for a period of 10 months. These results indicate that epizootic RVF was probably not present in the Nile Delta during 1984.
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