Abstract
Since 2006, Egypt has been affected by eleven various foot-and-mouth disease virus (FMDV) lineages. Accordingly, the nucleotide sequences of the 1D gene and the genes encoding the external capsid protein of some isolates of serotype O (the most predominant epidemic serotype in the country) collected from 2004 to 2017 were determined. All of these viruses (including the vaccine strain) belonged to serotype O, topotype ME-SA, and lineage Sharquia-72, and their sequences were of 98.6–98.9% identical to that of strain O1/Sharquia/EGY/72 (DQ164871), and differed from cultured and clinical (D197E) virus strains. The characteristic sites on the surface of the structural proteins of the Egyptian serotype O, topotype ME-SA viruses were located at residues 138 and 198 of VP1, residue 132 of VP2, and residues 56 and 104 of VP3. Furthermore, a phylogenetic tree revealed that Sharquia-72 was the only lineage present in Egypt for many decades prior to 2007. Unfortunately, however, during the last decade, five lineages of two separate topotypes of FMDV serotype O were detected in Egypt. Lineages Sharquia-72 and PanAsia-2 belong to topotype ME-SA and show ~ 14.5 to 17.5% intra-lineage divergence. In addition, lineages Qal-13, Ism-16, and Alx-17 cluster within topotype EA-3 and show ~ 4.5 to 15% intra-lineage diversity. The predecessors of the Egyptian EA-3 viruses are likely to have been from Sudan. Finally, at least a penta- or hexavalent vaccine comprising strains representing the endemic FMDV topotypes should be implemented on a wide scale in Egypt, which could combat the incursion of new lineages.
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Acknowledgements
We thank Prof. Dr. Laila EL-Shehawy, the Science and Technology Development Fund (STDF), http://www.STDF.org.egy, and the Egyptian Veterinary Serum and Vaccine Research Institute (VSVRI) for funding the research, Prof. Dr. Sonia Rizk for supporting and persuading the scientific committee of VSVRI to accept and fund the research, and finally, all the authors for funding the sequencing cost.
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Abu-Elnaga, H.I., Rizk, S.A., Daoud, H.M. et al. Comparative nucleotide sequencing of the VP1 capsid gene of recent isolates of foot-and-mouth disease virus serotype O from Egypt. Arch Virol 165, 2021–2028 (2020). https://doi.org/10.1007/s00705-020-04708-1
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DOI: https://doi.org/10.1007/s00705-020-04708-1