الفهرس 
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Abstract
Examination of 151 serum samples from susceptible (cattle) , 125 serum samples from contact animals (donkeys) and 97 serum samples from contact domestic fowl from tow governorates Kafer EL - Sheikh and El - Behera by using ELISA test prevailed to the prevalence rate in Kafer El - Sheikh respectively while in El - Behera the prevalence rate was 1315 , 536 and 049 respectivelyThis indicated that the prevalence rate of RVF in Kafer El - sheikh more prevalent than El - BeheraAnd also , detection of viral RNA of RVFV in mosquitoes samples collected along one year from Feb / 2004 to Jan / 2005 from Kafer El - Sheikh and El - Behera by using RT - PCRThis lead to detection viral RNA in mosquitoes from all months except (Dec / 2004 to Jan / 2005) in Kafer El - Sheikh while in El - Behera detected only in a three months (Jun , Aug and Sep / 2004) This indicated thatthe chance of the transmission of the RVF disease by mosquitoes is more in Kafer El - Sheikh than in El - Behera governorates.