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首页> 外文期刊>Journal of Medical Entomology >Significance and survival of enterococci during the house fly development.
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Significance and survival of enterococci during the house fly development.

机译：家蝇发育过程中肠球菌的意义和生存。

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House flies are among the most important nonbiting insect pests of medical and veterinary importance. Larvae develop in decaying organic substrates and their survival strictly depends on an active microbial community. House flies have been implicated in the ecology and transmission of enterococci, including multi-antibiotic-resistant and virulent strains of Enterococcus faecalis. In this study, eight American Type Culture Collection type strains of enterococci including Enterococcus avium, Enterococcus casseliflavus, Enterococcus durans, Enterococcus hirae, Enterococcus mundtii, Enterococcus gallinarum, Enterococcus faecalis, and Enterococcus faecium were evaluated for their significance in the development of house flies from eggs to adults in bacterial feeding assays. Furthermore, the bacterial colonization of the gut of teneral flies as well as the importance of several virulence traits of E. faecalis in larval mortality was assessed. Overall survival of house flies (egg to adult) was significantly higher when grown with typically nonpathogenic enterococcal species such as E. hirae (76.0% survival), E. durans (64.0%), and E. avium (64.0%) compared with that with clinically important species E. faecalis (24.0%) and E. faecium (36.0%). However, no significant differences in survival of house fly larvae were detected when grown with E. faecalis strains carrying various virulence traits, including isogenic mutants of the human clinical isolate E. faecalis V583 with in-frame deletions of gelatinase, serine protease, and capsular polysaccharide serotype C. Enterococci were commonly detected in fly puparia (range: 75-100%; concentration: 103-105 CFU/puparium); however, the prevalence of enterococci in teneral flies varied greatly: from 25.0 (E. casseliflavus) to 89.5% (E. hirae). In conclusion, depending on the species, enterococci variably support house fly larval development and colonize the gut of teneral adults. The human pathogenic species, E. faecalis and E. faecium, poorly support larval development and are likely acquired in nature by adult flies during feeding. House fly larvae do not appear to be a suitable model organism for assessment of enterococcal virulence traits.
机译：家蝇是具有医学和兽医学意义的最重要的无害虫。幼虫在腐烂的有机基质中生长，它们的存活严格取决于活跃的微生物群落。家蝇与肠球菌的生态学和传播有关，包括对粪肠球菌具有多重抗药性和强毒力的菌株。在这项研究中，评估了八种美国典型培养物收集类型的肠球菌，包括鸟肠球菌，卡塞利夫拉肠球菌，杜兰肠球菌，平肠肠球菌，芒氏肠球菌，鸡肠球菌，粪肠球菌和粪肠球菌，它们在家禽发育中的意义得到了评估。在细菌喂养试验中向成虫产卵。此外，评估了ten蝇肠道细菌的定殖以及粪肠球菌的几种毒力特性在幼虫死亡率中的重要性。与典型的非致病性肠球菌一起生长时，家蝇的总体存活率（从成虫到成年）显着高于平肠埃希菌（E. hirae）（76.0％存活率），杜兰斯E. durans（64.0％）和鸟舍肠杆菌（E. avium）（64.0％）。具有临床上重要的物种粪肠球菌（24.0％）和粪肠球菌（36.0％）。然而，与带有各种毒力特性的粪肠球菌菌株一起生长时，未检测到家蝇幼虫的存活率存在显着差异，包括人类临床分离的粪肠球菌V583的等基因突变体，其中明胶酶，丝氨酸蛋白酶和荚膜框缺失蝇p中普遍存在肠球菌（范围：75-100％;浓度：10 3 -10 5 CFU / pu）。然而，肠球菌在ten蝇中的患病率差异很大：从25.0（E. casseliflavus）到89.5％（E. hirae）。总之，取决于物种，肠球菌会可变地支持家蝇幼虫的发育并定殖成年幼体的肠道。粪肠球菌和粪肠球菌是人类致病菌，对幼虫的发育支持不佳，在饲养过程中很可能被成年蝇自然捕获。家蝇幼虫似乎不是适合评估肠球菌毒性特征的模型生物。

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