Abstract
Recently, an increasing number of multi drug resistant Salmonella species have been emerged due to overuse of antibiotics in veterinary and human medicine which has adverse consequences on public health. The present study was conducted with the aim of investigating the prevalence of Salmonella infection in village chickens in Sistan region and determining the prevalence of the antibiotic resistance genes in Salmonella isolated from these birds. In this study, 100 chickens were randomly selected from five counties of Sistan region. A cloacal swab sample was taken from each bird and also information about age, gender, breed, proximity with other birds, proximity with waterfowl, proximity with livestock, and receiving different antibiotics especially tetracycline were obtained using a questionnaire. Conventional culture methods used for Salmonella detection and isolation. Then, amplification of invA gene by PCR was used to confirm Salmonella colonies. Finally, 27 samples were confirmed to be infected with Salmonella by both culture and PCR methods. Disk diffusion method was used to determine the sensitivity to 4 antibiotics including; tetracycline, gentamicin, cefepime, and difloxacin. The results of the present study showed that proximity to waterfowl (OR = 0.273) significantly mitigates the risk of Salmonella infection. For the isolates, the highest resistance was recorded against cefepime and the highest susceptibility was to difloxacin. The presence proportion of tetA and tetB in tetracycline resistant isolates was higher than that in susceptible ones but this difference was not statistically significant.
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The datasets generated during the current study are not publicly available due to respect for people’s privacy but are available from the corresponding author on reasonable request.
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Acknowledgements
The authors of this article would like to thank the Mr. Ali Anoosha Ph.D., Agricultural Engineering- Animal Science, who helped us in sampling the chickens.
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This research is financially supported by the vice chancellor of research and technology, University of Zabol, under grants No. IR-UOZ-GR-2478; IR-UOZ-GR-7846.
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All authors especially Mohammad Jahantigh and Dariush Saadati contributed to the study conception and design. Materials were prepared by Golnaz Boraei-nejad and Dariush Saadati, data collection was performed by Golnaz Boraei-nejad and Samira Saadat-jou, and the data were analyzed by Dariush Saadati and Samira Saadatjou. All tests, including bacterial culture, PCR, and antibiogram, were performed by Golnaz Boraei-nejad under the supervision of Dr. Mohammad Jahantigh. The first draft of the manuscript was written by Dariush Saadati and Golnaz Boraei-nejad, and all authors commented on previous versions of the manuscript. All authors approved the final manuscript.
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This is an observational study. The protocol of the present research was reviewed and approved by vice chancellor for academic affairs of the Veterinary Faculty of Zabol University and the vice chancellor has confirmed that no ethical approval is required.
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Boraei-nezhad, G., Saadati, D., Jahantigh, M. et al. Prevalence of Salmonella infection in village chickens and determination of the tetracycline resistance genes in the Salmonella isolates in the Sistan region, Iran. Braz J Microbiol 54, 2375–2382 (2023). https://doi.org/10.1007/s42770-023-01033-y
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DOI: https://doi.org/10.1007/s42770-023-01033-y