Simjee S, White D G, Wagner D D, Meng J, Qaiyumi S, Zhao S, McDermott P F
U.S. Food and Drug Administration Center for Veterinary Medicine, Laurel, Maryland 20708, USA.
Antimicrob Agents Chemother. 2002 Dec;46(12):3823-8. doi: 10.1128/AAC.46.12.3823-3828.2002.
Sixteen isolates of Enterococcus faecalis were recovered from retail poultry samples (seven chickens and nine turkeys) purchased from grocery stores in the greater Washington, D.C., area. PCR for known streptogramin resistance genes identified vat(E) in five E. faecalis isolates (three isolates from chickens and two isolates from turkeys). The vat(E) gene was transmissible on a ca. 70-kb plasmid, along with resistance to erythromycin, tetracycline, and streptomycin, by conjugation to E. faecalis and Enterococcus faecium recipient strains. DNA sequencing showed little variation between E. faecalis vat(E) genes from the chicken samples; however, one E. faecalis vat(E) gene from a turkey sample possessed 5 nucleotide changes that resulted in four amino acid substitutions. None of these substitutions in the vat(E) allele have previously been described. This is the first report of vat(E) in E. faecalis and its transferability to E. faecium, which indicates that E. faecalis can act as a reservoir for the dissemination of vat(E)-mediated streptogramin resistance to E. faecium.
从华盛顿特区大都市区杂货店购买的零售家禽样本（7只鸡和9只火鸡）中分离出16株粪肠球菌。对已知的链阳菌素抗性基因进行PCR检测，在5株粪肠球菌分离株（3株来自鸡，2株来自火鸡）中鉴定出vat(E)基因。vat(E)基因可通过与粪肠球菌和屎肠球菌受体菌株进行接合转移到约70 kb的质粒上，并同时赋予对红霉素、四环素和链霉素的抗性。DNA测序显示，来自鸡肉样本的粪肠球菌vat(E)基因之间差异很小；然而，来自一只火鸡样本的粪肠球菌vat(E)基因有5个核苷酸变化，导致4个氨基酸替换。vat(E)等位基因中的这些替换此前均未被描述过。这是粪肠球菌中vat(E)基因及其向屎肠球菌转移能力的首次报道，这表明粪肠球菌可作为将vat(E)介导的链阳菌素抗性传播给屎肠球菌的储存库。
