Molecular Characterization of Recent Isolates of Bef Virus in Egypt
Albehwa, A., Ismaeil, W., Fakhry, H., El-Emam, H. (2017). Molecular Characterization of Recent Isolates of Bef Virus in Egypt. EKB Journal Management System, 2(1), 137-144. doi: 10.21608/bjas.2017.164028
A.M. Albehwa; W.M. Ismaeil; H.M. Fakhry; H.S. El-Emam. "Molecular Characterization of Recent Isolates of Bef Virus in Egypt". EKB Journal Management System, 2, 1, 2017, 137-144. doi: 10.21608/bjas.2017.164028
Albehwa, A., Ismaeil, W., Fakhry, H., El-Emam, H. (2017). 'Molecular Characterization of Recent Isolates of Bef Virus in Egypt', EKB Journal Management System, 2(1), pp. 137-144. doi: 10.21608/bjas.2017.164028
Albehwa, A., Ismaeil, W., Fakhry, H., El-Emam, H. Molecular Characterization of Recent Isolates of Bef Virus in Egypt. EKB Journal Management System, 2017; 2(1): 137-144. doi: 10.21608/bjas.2017.164028

Molecular Characterization of Recent Isolates of Bef Virus in Egypt

Benha Journal of Applied Sciences
Article 14, Volume 2, Issue 1, March 2017, Page 137-144  XML PDF (806.7 K)
Document Type: Original Research Papers
DOI: 10.21608/bjas.2017.164028
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Authors
A.M. Albehwa1; W.M. Ismaeil; H.M. Fakhry; H.S. El-Emam2
1Veterinary Serum and Vaccine Research Institute, Abassia, Cairo
22Faculty of Veterinary Medicine, Zagazig Univ., Egypt
Abstract
The present work was conducted to identify and characterize recent isolate of bovine ephemeral fever virus (BEFV) in Egypt. 103 serum samples were obtained from 1600 vaccinated animals in El-Salhia dairy farm during the period of July to August 2015. The 103 animals were found to have non-protective low titers of BEF antibodies (≤2-8) as tested by serum neutralization test (SNT), showing BEF signs (fever; harried respiration; lameness and recumbency). Three buffy coat and five blood plasma samples from the 103 suspected infected dairy cattle were collected. Trials of virus isolation in baby mice brain and BHK21 cell culture revealed that three samples of buffy coat and five blood plasma samples were suspected to contain BEFV. Virus identification using virus neutralization tests (VNT) and direct fluorescent antibody technique (FAT) confirmed the presence of BEFV. In addition, PCR, sequencing analysis and phylogenetic tree showed that the obtained isolate is closely related to Egypt-2005 strain. These findings indicated that the locally produced vaccine is highly immunogenic inducing a protection rate of 93.6%. Appearance of disease signs in cattle with low immune levels could be due to parturition and high lactation stress factors in addition to suspected other infection leading to poor immune response (immune suppression) to the vaccine.
Keywords
Bovine ephemeral fever (BEFV); Isolation; Identification; PCR; FAT.v
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