Prevalence of Aeromonashydrophila and Yersinia Enterocolitica in some sea foods sold in sharkia governorate markets and the effects of heat treatments on their viabilities

S. E. Dien, Wm Enas, M. Sami, M. Hanan, El Lawendi, Masoumeh Saleh
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引用次数: 7

Abstract

Total of 120 samples of fresh mullet fish, frozen tilapia fillet and chilled shrimps (40 samples from each) were collected from Sharkia Governorate markets to assess the presence of Aeromonas hydrophila and Yersinia enterocolitica short methods. The results showed that the prevalence of Aeromonas spp. were 34 (85%), 12 (30%) and 28 (70%) for mullet fish, frozen tilapia fillet and shrimp samples respectively, the mean total colony count of this microorganism were 4.91 ±0.247, 4.383 ±0.463 and 4.44 ±0.125 log/ CFU in the same order. Aeromonas hydrophila, A. caviae and A. sobria were present in the examined samples, but A. hydrophila was the common species. Concerning Yersinia spp., it was detected in 26 (65%), 6 (15%) and 20 (50%) samples of mullet fish, frozen tilapia fillet and shrimp samples respectively, with the mean total colony counts of 5.142±0.353, 4.284 ±0.671 and 3.06±0.221 log/ CFU respectively in the same order. Y. enterocolitica, Y. fredrediksenii, Y. Intermedia and Y. Kristensenii were detected in the examined samples, while; Y. enterocolitica is the most predominant isolate. From the present investigation, both A. hydrophila and Y. enterocolitica are sensitive to heat treatment. Thus, good ripening of sea foods is adequate to control these microorganisms.
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沙尔基亚市售海产品中嗜水气单胞菌和结肠炎耶尔森菌的流行及热处理对其生存力的影响
从Sharkia省市场共收集了120份新鲜鲻鱼、冷冻罗非鱼鱼片和冷冻虾(各40份)样本,以评估嗜水气单胞菌和小肠结肠炎耶尔森菌的存在。结果表明,在乌鱼、冷冻罗非鱼鱼片和对虾样品中,气单胞菌的检出率分别为34(85%)、12(30%)和28(70%),菌落总数依次为4.91±0.247、4.383±0.463和4.44±0.125 log/ CFU。检出嗜水气单胞菌、洞穴单胞菌和嗜水气单胞菌,但嗜水气单胞菌为常见种。乌鱼、冷冻罗非鱼片和对虾样品中检出耶尔森菌26例(65%)、6例(15%)和20例(50%),平均菌落总数依次为5.142±0.353、4.284±0.671和3.06±0.221 log/ CFU。检出小肠结肠炎耶氏菌、弗雷德氏耶氏菌、中间耶氏菌和克里斯滕森耶氏菌;小肠结肠炎菌是最主要的分离菌。从目前的调查来看,嗜水单胞菌和小肠结肠炎单胞菌都对热处理敏感。因此,成熟的海产品足以控制这些微生物。
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