食源性气单胞菌属种水平监测和表型特征研究
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王闻卿 男 本科 研究方向为微生物检验 E-mail:wwq95@163.com

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国家科技重大专项(2012ZX10004201);卫生行业科研专项(201202006);上海市浦东新区卫生系统重点学科建设(PWZxk2010-09)


Monitoring and phenotype characteristics study on food-borne Aeromonas species
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    摘要:

    调查上海市浦东新区食源性气单胞菌的属种分布和表型特征。方法 2011年5~11月,对采集自上海市浦东新区2个农贸市场的3种生鲜食品(共291份)进行气单胞菌属的选择性分离和属种水平鉴定;分析菌株表型特征的差异性。结果 291份生鲜食品样品中,74份阳性,总检出率25.4%。 其中肉制品阳性检出率最高,为34.1%(43/126);水产品和蔬菜阳性检出率分别为18.9%(17/90)和18.7%(14/75)。经系统生化鉴定的74株气单胞菌属菌株包括:嗜水气单胞菌23株,维隆气单胞菌温和生物变种35株,豚鼠气单胞菌16株。溶血试验和蛋白酶表达测试显示分别有51株菌β溶血素阳性,59株菌蛋白酶试验阳性,两者皆阳性的菌株有48株。抗生素敏感性试验表明,多数菌株对头孢噻肟、头孢他啶、头孢吡肟、庆大霉素、环丙沙星、左氧氟沙星呈现高度敏感,但对氨苄西林呈现高度耐药;对含青霉素酶药物(奥格门丁)的耐药能力存在种水平的差异;3种气单胞菌均存在低水平的多重耐药(MDR)。结论 上海市浦东新区农贸市场流行季节供应的主要生鲜食品气单胞菌属污染程度较高,除嗜水气单胞菌外的其他气单胞菌株也具有毒力因子,虽然目前耐药水平较低,但仍需加强基于食物链的食源性疾病的综合监测。

    Abstract:

    To investigate the distribution and phenotype characteristics of food borne Aeromonas spp.in Pudong New Area.MethodsAeromonas strains were isolated and identified to species level in 3types of fresh food samples collected from 2markets during May to November in 2011, and the difference of phenotype characteristics among isolates were analyzed. Results74strains of Aeromonas, including 23strains of A.hydrophila, 35strains (12.0%) of A.veronii biovar sobia and 16strains of A.caviae, were isolated from 291samples. The highest isolation rate was 34.1% in meat product, followed by 18.9% in aquatic product and 18.7% in vegetable. Of all the 74isolated strains, 51strains produced β-hemolysin, 59strains produced protease, and 48strains produced both β-hemolysin and protease. Antimicrobial susceptibility tests to 12antibiotics showed most strains were highly susceptible to Cefotaxime, Ceftazidime, Cefepime, Gentamicin, Ciprofloxacin and levoflxacin, while highly resistant to Ampicillin and the antibiotic resistance rate to Amoxicillin-Clavulanic acid had statistical difference among species. Low level of multi-drug resistance(MDR) existed in Aeromonas spp.ConclusionFresh foods in markets were highly contaminated by Aeromonas spp. during prevalent seasons. Aeromonas strains other than A.hydrophila also carried virulence factors. Though resistance to antibiotics was not serious, integrated monitoring of food borne disease based on food chain was necessary.

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王闻卿,苏靖华,傅慧琴,郑英杰,朱林英,傅益飞,孙乔.食源性气单胞菌属种水平监测和表型特征研究[J].中国食品卫生杂志,2014,26(1):1-5.

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  • 收稿日期:2013-09-23
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  • 在线发布日期: 2014-03-04
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