RESUMO
In early February 2006, a foot-and-mouth disease [FMD] outbreak has struck cattle and buffaloes in different localities of Egypt exerting severe economic losses to livestock industry. Representative specimens [tongue epithelium and foot vesicular fluid] were collected from severely infected foreign [imported from Ethiopia] and local cattle in different governorates [Ismailia, Sharqia and Behairah]. Several assays of reverse transcription [RT] using random decamer primers, followed by FMDV VP1- based polymerase chain reaction [PCR], were used for rapid identification of the causative agent in clinical specimens, basically to circumscribe the countrywide spread of infection. The first PCR assay, utilizing a FMDV universal primer set, could identify the outbreak causative agent as a FMDV in all clinical specimens. FMDV specific primers were then utilized to determine the outbreak FMDV serotype. The specific PCR amplification products [amplicons] were purified and subjected to direct nucleotide sequencing. Blast searches, multiple alignments and phylogenetic analyses of the nucleotide sequence data revealed that outbreak FMDV is a serotype "A" which is a new serotype incursion to Egypt. Direct sequencing of the PCR amplicons was proved a relevant discriminative tool for genetic characterization of FMDV strains / isolates. Results of this endeavor initiated the potential to produce a bivalent FMDV vaccine, containing both of serotypes A and O[1], for the first time in Egypt