Isolation, Identification and Antimicrobial Resistance Profile of Salmonella in Raw cow milk & its products in Bishoftu city, central Ethiopia: implication for public health.
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Abstract
Background: Salmonella is a significant foodborne pathogen, with milk and milk products commonly implicated in its transmission. However, limited information is available regarding the direct link between antimicrobial use (AMU), dairy hygiene practices, and antimicrobial resistance (AMR) in Salmonella strains isolated from dairy products in Bishoftu town.
Methods: Cross-sectional research was done from October 2023 to April 2024 to assess dairy farmers' antimicrobial usage (AMU) and hygiene practices and the occurrence of antimicrobial resistance (AMR) profiles of Salmonella isolated from raw cow milk and its products. A structured questionnaire was also used to assess the milk value chain's knowledge, attitude, and practices (KAP) regarding AMU, AMR, and hygiene practices. Salmonella isolation and identification was conducted using standard microbiological techniques and further confirmation was carried out using the OmniLog system. An antimicrobial susceptibility test was performed using the Kirby-Bauer disk diffusion technique..Data was analyzed using STATA version 14.2.
Results: Among 41 dairy farmers interviewed, it was found that most of the respondents had sufficient knowledge (78%), desired attitudes (90%), and good practices (76%) regarding AMU and AMR. However, 36% of dairy farms had poor hygienic practices. Overall, 2% (n = 4) of the samples tested positive for S. enterica. Of the 4 isolates, 3 were identified in dairy farm samples, whereas 1 was isolated from milk vendors. However, no Salmonella was identified in cheese or yoghurt samples obtained from the restaurants. Regarding the AMR profile, S. enterica isolates were resistant to amoxicillin (75%), streptomycin (75%), and tetracycline (50%). Resistant to two or more antimicrobials were identified in 75% of the isolates.
Conclusion: This study indicated contamination of cow milk and its products with S. enterica. Therefore, appropriate control measures, including awareness creation among personnel and improving hygienic practices at the milk value chains is recommended to mitigate cross-contamination.
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