Department of Veterinary Medicine

Permanent URI for this collectionhttps://etd.hu.edu.et/handle/123456789/95

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    ISOLATION, MOLECULAR DETECTION AND ANTIMICROBIAL SUSCEPTIBILITY OF SALMONELLA FROM COW MILK AND BEEF IN SELECTED DISTRICTS OF SIDAMA REGIONAL STATE, ETHIOPIA
    (HAWASSA UNIVERSTY, 2023-10) TARIKU GEINORO ALLEYO
    Salmonella is one of the most common causes of foodborne diseases and frequently reported for exacerbating increase of multi-drug resistance worldwide. Unhygienic practices throughout food chain and cultural habits of raw animal products contributed for the expansion of the infection and increment in antimicrobial resistance especially in developing world like Ethiopia. A cross- sectional type of study was conducted from December, 2022 to June, 2023. The study was aimed with isolation, molecular detection and determination of antimicrobial susceptibility of Salmonella from cow milk and beef in Hawassa, Yirgalem and Wondo Genet districts of Sidama Regional State. A total of 216 samples of which 152 milk and 64 beef samples were collected with purposive and simple random sampling methods for isolation and biochemical identification of Salmonella. Positive isolates obtained from bacteriological and biochemical tests were further confirmed by polymerase chain reaction (PCR). Then, the isolate’s antimicrobial susceptibility profile was tested by using disk diffusion method for twelve selected antimicrobials. SPSS windows version 25.0 was used for statistical analysis. Fisher’s exact test was the measure of association of isolates with different attributes. Bacteriological and biochemical detection tests revealed that 6.5% (N=14/216) Salmonella was isolated from the total sample. However, in molecular detection, only 9 of the 14 isolates were confirmed to be Salmonella using PCR test, which was 4.17% of the total. The proportion was 5.38%, 3.23%, and 2.38% in Hawassa, Yirgalem and Wondo Genet districts, respectively. There was no significant variation in prevalence among the districts and between sample types milk (3.9%) and beef (4.7%) (p > 0.05). Similarly, no significant (p > 0.05) variation was observed in the Salmonella isolation rate among retailers (4.84%), households (5.56%) and farms (1.85%) as well as between yoghurt (6.45%) and raw (3.31%) milk. The result of the antimicrobial susceptibility test showed that Salmonella isolates were 100% resistant to ampicillin, nalidixic acid, clindamycin and cephalothin while they were above 50% sensitive to ceftriaxone, chloramphenicol and gentamycin. Multi-drug resistance (MDR) was demonstrated in all isolates. Overall, this study showed that Salmonella was prevalent in cow milk and beef produced and consumed; and developed MDR which may pose public health concern in the study area. Thus, subsequent regular investigations on serotypes, AMR genes and risk factors as well as rational use of antimicrobials is necessary.
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    ISOLATION, MOLECULAR IDENTIFICATION AND ANTIMICROBIAL SUSCEPTIBILITY PROFILING OF ESCHERICHIA COLI O157:H7 STRAIN ISOLATED FROM ANIMAL-ORIGIN FOODS IN HAWASSA AND YIRGALEM, SIDAMA, ETHIOPIA.
    (HAWASSA UNIVERSITY, 2024-11) WORKAGEGN ISRAEL ASALE
    Escherichia coli O157:H7, an important foodborne pathogen, posing serious public health concern globally. This study conducted from December 2022 to July 2023 with the aim to isolate, molecularly identify and evaluate the antimicrobial susceptibility profiles of Escherichia coli O157:H7 isolated from animal-origin foods including beef, raw milk and fish in Hawassa and Yirgalem towns of Sidama region, Ethiopia. In this study, a total of 298 different samples were collected and analyzed for isolation and identification of Escherichia coli O157:H7 using culture, biochemical tests and PCR analysis. PCR analysis showed that Escherichia coli O157:H7 was isolated from 3.7% of the total samples of which 5.6% and 6.25% were isolated from beef and fish samples, respectively, and no Escherichia coli O157:H7 isolate was observed from milk samples. The observed isolation rate among the different food type samples was statistically significant (p = 0.036). It was revealed that meat samples collected from butcher shops were found to be more (7.6%) contaminated by Escherichia coli O157:H7 than samples from abattoirs (3.4%) (p = 0.445). Regarding fish samples, contamination level was greater in Nile tilapia (8.1%) than Catfish. Similarly, higher (7.3%) contamination was observed from samples collected from Gudumalle fish landing site than other sites. Moreover, fish skin was the more (8.6%) contaminated organ than fish muscle (3.4%). Antibiotic susceptibility test demonstrated that all Escherichia coli O157:H7 isolates exhibited 100% susceptibility to ciprofloxacin, nalidixic acid, chloramphenicol, cephalothin, ceftazidime, ceftriaxone, tetracycline, and gentamicin whereas a 81.8%, 45.5% and 100%resistance was observed in amoxacillin, streptomycin and clindamycin, respectively. The multidrug resistance observed in 45.45% of isolates with the calculated MDR index of 0.27, and no extended-spectrum beta-lactamase (ESBL) producing isolates were detected. The findings highlight the need for stringent hygiene practices and effective monitoring of animal origin foods to minimize the risk of public health threats.