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Presence and Mechanism of Antimicrobial Resistance among Enterococci from Cats and Dogs
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Journal Article
Presence and Mechanism of Antimicrobial Resistance among Enterococci from Cats and Dogs
2005
Overview
The presence and mechanism of acquired resistance to erythromycin, tylosin, lincomycin, quinupristin/dalfopristin,
tetracycline, chloramphenicol, gentamicin, kanamycin, and vancomycin were determined in 97 and
104 enterococci isolated from rectal swabs of cats and dogs, respectively. Eleven feline and three canine enterococcal
isolates contained the
aac(6')-Ie-aph(2'')-Ia
gene encoding high-level resistance to gentamicin, an
antibiotic often used for treating enterococcal infections in humans. The combination of
erm
(B) and
vat
(E)
genes encoding resistance to streptogramins was detected in one canine quinupristin/dalfopristin-resistant
Enterococcus
faecium
isolate. Four quinupristin/dalfopristin-resistant enterococci only contained the
erm
(B) gene.
Cross resistance against macrolides and lincosamides (30%) and resistance against tetracyclines (55%) was
found to be widely distributed among enterococci from pets. In all of the feline and in 93% of the canine
macrolide and lincosamide-resistant isolates, this resistance was encoded by the
erm
(B) gene.
tet
(M) was the
most prevalent tetracycline resistance gene. It was detected in 91% of the feline and 86% of the canine tetracycline-
resistant enterococci. A high occurrence of the Tn
916
/Tn
1545
transposon family was found among
these
tet
(M)-positive isolates. Enterococci from pet animals with resistance against vancomycin were not found.
This study shows that enterococci from the intestinal microbiota of cats and dogs may act as a reservoir of
resistance genes for animal or human pathogens.
Publisher
Mary Ann Liebert, Inc,SAGE Publications
