Adhesion of Pathogenic Bacteria to Food Contact Surfaces: Influence of pH of Culture.
Adhesion of Pathogenic Bacteria to Food Contact Surfaces: Influence of pH of Culture.
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DOI：
10.1155/2011/746356
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发表时间：
2011-01-01
影响因子：
3.4
通讯作者：
Goulet, Jacques
中科院分区：
文献类型：
--
作者：
Mafu, Akier Assanta;Plumety, Corinne;Goulet, Jacques
烟曲霉仍然是鸟类呼吸道的主要病原体。在家禽中，A.烟曲霉可能引起重大的经济损失，特别是在火鸡生产中。A.在室内农场环境中，烟曲霉容易在质量差的垫料或受污染的饲料中生长和产孢。通风不足和多尘的条件增加了鸟类接触气溶胶孢子的风险。急性病例见于幼小动物吸入孢子后，导致高发病率和死亡率。慢性形式影响老年鸟类，看起来更零星。呼吸道是A.烟曲霉病的发展导致严重的呼吸窘迫和相关的肉芽肿性气囊炎和肺炎。对受感染家禽的治疗是不存在的;因此，预防是保护家禽的唯一途径。鸟类曲菌病模型的开发可以提高我们对其发病机制的认识，而目前对其发病机制的认识还很不足。研究了嗜水气单胞菌、大肠杆菌O 157：H7、肠炎沙门氏菌和金黄色葡萄球菌在不同pH值（6、7和8）培养物中对疏水性和亲水性表面的粘附。结果表明，材料类型对微生物的附着能力没有影响，而环境pH值影响A. Escherichia，E. coli和S.金黄色葡萄球菌对两种固体基质的吸附。S.肠溶酶活性不受底物种类和培养pH的影响（P > 0.05），而E. coli对聚苯乙烯和玻璃表面的亲和力最弱。材料的物理化学性质或细菌与细菌粘附率之间没有相关性，除了S。金黄色的显微照片显示表面被小簇的S.肠杆菌S.金黄色葡萄球菌以小链或细胞聚集体的形式侵入食品接触表面。
Aspergillus fumigatus remains a major respiratory pathogen in birds. In poultry, infection by A. fumigatus may induce significant economic losses particularly in turkey production. A. fumigatus develops and sporulates easily in poor quality bedding or contaminated feedstuffs in indoor farm environments. Inadequate ventilation and dusty conditions increase the risk of bird exposure to aerosolized spores. Acute cases are seen in young animals following inhalation of spores, causing high morbidity and mortality. The chronic form affects older birds and looks more sporadic. The respiratory tract is the primary site of A. fumigatus development leading to severe respiratory distress and associated granulomatous airsacculitis and pneumonia. Treatments for infected poultry are nonexistent; therefore, prevention is the only way to protect poultry. Development of avian models of aspergillosis may improve our understanding of its pathogenesis, which remains poorly understood.The adhesion of Aeromonas hydrophila, Escherichia coli O157:H7, Salmonella Enteritidis, and Staphylococcus aureus to hydrophobic and hydrophilic surfaces in cultures with different pHs (6, 7, and 8) was studied. The results indicated that the type of material had no effect on the attachment capacity of microorganisms, while environmental pH influenced the adhesion of A. hydrophila, E. coli, and S. aureus to both solid substrates. The attachment of S. Enteritidis (P > .05) was not affected by the type of substrate or the culture pH, whereas E. coli displayed the weakest affinity for both polystyrene and glass surfaces. No correlation was established between the physicochemical properties of the materials, or the bacterial and the rate of bacterial adhesion, except for S. aureus. Photomicrographs have shown that surfaces were contaminated by small clusters of S. Enteritidis while S. aureus invaded the food contact surfaces in the form of small chains or cell aggregates.