Search

Clostridium perfringens (C. perfringens) is a Gram-positive anaerobic spore-forming bacterium that is widespread in environmental soil and sewage, as well as in animal intestines. C. perfringens is an important pathogen in both human and veterinary medicine. The incidence and numbers of C. perfringens in the intestinal contents of 100 cattle, 86 turkey and 177 chickens from September 2015 to April 2016 were determined. C. perfringens was found in 26%, 22% and 40% of intestinal contents of cattle, turkey and chickens, respectively. In this research samples were tested for isolation of C. perfringens by culturing and biochemical method and then they were confirmed by the polymerase chain reaction (PCR) methods. We suggest that PCR assay could be a replacement of the culture method for quantifying C. perfringens in the intestinal tracts. These research helping us to establish the role of each C. perfringens toxin in animal disease, to investigate the in vivo mechanism of action of these toxins, and to develop more effective vaccines against diseases produced by these microorganisms.

Bovine herpes virus type 1 (BHV-1), the causative agent of infectious bovine rhinotracheitis, is a DNA virus. This pathogen is represents the most common viral pathogen found in cattle semen. The aim of the present study was to set up a of BHV-1 detection assay in bovine blood in Lorestan province using PCR assay. The blood samples of 285 cattle in Khoramabad, Azna, Aligoodarz, Borujerd and Poldokhtar were collected, total DNA was extracted and the region encoded the gI glycoprotein was amplified by PCR using specific primers. Out of 285 blood samples, 56 (19.64%) were positive for BHV-1 (468 bp). The highest and lowest frequencies of the bacterial infection were observed in Khoramabad and Borujerd cities with 21 and 12%, respectively. The results of this study demonstrated that PCR assay represent an excellent (suitable) alternative or additional tool for BHV-1 isolates detection. Finally the study revealed a high incidence of BHV-1 in the blood of Iranian cattle. Thus all cattle must be tested periodically for BHV-1 infection and antimicrobial drugs, to prevent BHV-1 occurrence in cattle must be used. The cattle must be free BHV-1 infection prior to use.