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1、禽大肠杆菌分型和药物敏感性试验摘要：2009年1月-2011年1月两年内，在华东地区145个放养肉鸡群中分离到177株大肠杆菌，其中91株主要分离自2-8周龄雏鸡，与雏鸡复杂的气囊炎有关。血清分型结果表明优势血清组为O2,O35和 O78，还有大量分离株不能确定血清组。三种优势血清组中每一组50%以上分离株来自有大肠杆菌病的肉鸡，而在临床表现正常的1日龄雏鸡的气囊中没有检测到细菌。大多数分离株对氯霉素、庆大霉素、萘啶酮酸、壮观霉素、新霉素和氨苄青霉素敏感。不到25%的分离株对链霉素、四环素和呋喃妥英耐药。关键词：大肠杆菌；分型；药物敏感性Chloramphenicol氯霉素Gentamicin
2、庆大霉素 nalidixic acid萘啶酮酸Spectinomycin壮观霉素Neomycin新霉素 ampicillin氨苄青霉素Streptomycin链霉素Tetracyclines四环素Nitrofurantoin呋喃妥英Serotypes and antibiotic sensitivity of avian Escherichia coli.Over a two-year period(January 2009 to January 2011),177 Escherichia coli isolates were obtained from 145 field-reared br
3、oiler flocks in the eastern China.Ninety-one isolates obtained from the field-reared birds between 2 and 8 weeks of age were associated with complicated air-sac disease.Serotyping efforts demonstrated a predominance of O2,O35,and O78 serogroups and a large number of untypable isolates.More than 50%o
4、f the isolates in each of the three dominant serogroups were collected from broilers with colibacillosis,but they were never detected in the yolk-sac samples of clinically normal day-old hatchery chickens.The majority of the isolates were sensitive to chloramphenicol,gentamicin,nalidixic acid,spectinomycin,neomycin,and ampicillin.Less than 25%of the isolates were resistant to streptomycin,tetracyclines and nitrofurantoin.keywords：Escherichia coli；Serotype；antibiotic sensitivity