Abstract

Objective: To characterize intra-isolates variation between clinical isolates of Pasteurella multocida (P. multocida) isolated from sheep, cattle and buffalo at molecular level to check the distribution of pneumonia and hemorrhagic septicemia in some regions of Fayoum, Egypt. Methods: These isolates were obtained from various locations in the Fayoum Governorate, Egypt and they were identified by amplifying 16S rDNA and KMT1 genes using their DNA as a template in PCR reaction. Results: The results demonstrated that the five selective isolates of P. multocida had similar size of PCR products that generated one band of 16S rDNA having 1 471 bp and KMT1 gene having 460 bp. The phylogenetic tree and similarity of the five selective isolates of P. multocida which were collected from GenBank database were calculated and analyzed for the nucleotide sequence of 16S rDNA and KMT1 genes. The sequencing result of 16S rRNA gene product (1 471 bp) for the five selective isolates of P. multocida showed that the isolates of sheep (FUP2) shared 94.08%, 88.10% homology with the buffalo isolate (FUP8) and cattle isolate (FUP9) respectively, whereas, the buffalo isolate (FUP5) shared 98.18% and 94.40% homology with the cattle isolates (FUP12 and FUP9). Conclusions: The results indicated the relationships of P. multocida isolated from buffalo and cattle rather than the close relationships between P. multocida isolated from cattle and sheep. Diagnosis of P. multocida by 16S rDNA and KMT1 gene sequences was important to determine the antigen that is responsible for protective cover within the same group of animals and to help for the production of new vaccines for the control of microbial infection for domestic animals.

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