Abstract
From October 1985 through November 1986, 1714 presumably unvaccinated sheep in 13 nomadic flocks located in four provinces in Dakahliya Governorate, in the northeast Nile Delta, were ear tagged and monitored for acquisition of Rift Valley fever virus (RVFV) antibodies. Sheep were bled at approximately 3 month intervals and sera were tested for haemagglutination inhibition (HI) antibodies to RVFV. Base line results showed 1.2% prevalence of HI antibody to RVFV with titres from 1:20 to 1:320. The data indicate absence of RVFV transmission to sheep in Dakahliya Governorate during the period of the study.