Briggs C E, Fratamico P M
Agricultural Research Service, U.S. Department of Agriculture, Wyndmoor, Pennsylvania 19038, USA.
Antimicrob Agents Chemother. 1999 Apr;43(4):846-9. doi: 10.1128/AAC.43.4.846.
Salmonella typhimurium phage type DT104 has become an important emerging pathogen. Isolates of this phage type often possess resistance to ampicillin, chloramphenicol, streptomycin, sulfonamides, and tetracycline (ACSSuT resistance). The mechanism by which DT104 has accumulated resistance genes is of interest, since these genes interfere with treatment of DT104 infections and might be horizontally transferred to other bacteria, even to unrelated organisms. Previously, several laboratories have shown that the antibiotic resistance genes of DT104 are chromosomally encoded and involve integrons. The antibiotic resistance genes conferring the ACSSuT-resistant phenotype have been cloned and sequenced. These genes are grouped within two district integrons and intervening plasmid-derived sequences. This sequence is potentially useful for detection of multiresistant DT104.
鼠伤寒沙门氏菌DT104噬菌体类型已成为一种重要的新出现病原体。这种噬菌体类型的分离株通常对氨苄青霉素、氯霉素、链霉素、磺胺类药物和四环素具有抗性(ACSSuT抗性)。DT104积累抗性基因的机制备受关注,因为这些基因会干扰DT104感染的治疗,并且可能水平转移至其他细菌,甚至是不相关的生物体。此前,多个实验室已表明DT104的抗生素抗性基因是由染色体编码的,且涉及整合子。赋予ACSSuT抗性表型的抗生素抗性基因已被克隆和测序。这些基因被归为两个不同的整合子以及其间的质粒衍生序列。该序列对于检测多重耐药的DT104可能有用。