Bacteriological Analysis of Contamination Level of Selected Vegetables Sold in Some Markets in Niamey, Niger

Almou Abdoulaye Alio, Alio Fody Mahamadou, Chaibou Yaou, Alio Sanda Abdel-Kader, Rabiou Mamane Moustapha, Hamidou Djelifa, Soumana Sourounda Idé, Mamadou Lewamy, H. Seini, Sadou Hassimi
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Abstract

Vegetables are an important food source of nutrients, vitamins and dietary fiber, and therefore play a vital role in human health and well-being. Unfortunately, they are perishable products that could be vectors for the transmission of infectious diseases. The aim of this study was to analyses the level of bacteriological contamination of the samples of tomatoes (29), carrots (12), lettuces (47) and onions (12) sold in five (5) markets of community urban of Niamey. To this end, contamination indicator germs such as Total Aerobic Mesophilic Flora (TAMF), Total Coliforms (TC), Faecal Coliforms (FC), Enterobacteria (Ent), Faecal Streptococci (FS), Clostridium perfringens (CP) and Escherichia coli (E. coli) were enumerated, using methods specific to each germ. Analysis of the results showed tomatoes to be highly contaminated with FS, CP and E. coli (9.75±1.81.105; 1.33±2.30.105 and 2.25±2.48.105 CFU/g respectively), carrots with TAMF, FC, Ent (1.37±1.24.107; 4.48±0.34.106; 7.44±0.34.106 CFU/g respectively) and onions with TC (4.45±0.84.106 CFU/g). The sanitary quality of these vegetables is low. Hence the need for strict compliance with good hygiene practices in markets to ensure a healthy vegetable.
对尼日尔尼亚美一些市场上销售的部分蔬菜污染程度的细菌学分析
蔬菜是营养素、维生素和膳食纤维的重要食物来源,因此对人类的健康和福祉起着至关重要的作用。遗憾的是,蔬菜属于易腐产品,可能成为传染病的传播媒介。本研究的目的是分析在尼亚美社区城区五(5)个市场销售的西红柿(29)、胡萝卜(12)、生菜(47)和洋葱(12)样品的细菌污染程度。为此,使用针对每种病菌的特定方法对污染指标病菌进行了计数,如总需氧中嗜酸性菌群(TAMF)、总大肠菌群(TC)、粪大肠菌群(FC)、肠杆菌(Ent)、粪链球菌(FS)、产气荚膜梭菌(CP)和大肠杆菌(E. coli)。分析结果显示,番茄受到 FS、CP 和大肠杆菌的高度污染(分别为 9.75±1.81.105;1.33±2.30.105 和 2.25±2.48.105 CFU/g),胡萝卜受到 TAMF、FC 和 Ent 的高度污染(分别为 1.37±1.24.107;4.48±0.34.106;7.44±0.34.106 CFU/g),洋葱受到 TC 的高度污染(4.45±0.84.106 CFU/g)。这些蔬菜的卫生质量较低。因此,市场上需要严格遵守良好的卫生规范,以确保蔬菜的健康。
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