Prevalence of trimethoprim resistance genes in Escherichia coli isolates of human and animal origin in Lithuania.

Abstract:

:A total of 456 non-repetitive Escherichia coli isolates from human clinical specimens (urinary, n=134; cervix, vagina and prostate, n=52; blood, pus and wounds, n=45), healthy animals (cattle, n=45; poultry, n=20) and diseased animals (cattle, n=53; swine, n=64; poultry, n=43) obtained in Lithuania during the period 2005-2008 were studied for trimethoprim (TMP) resistance and the prevalence of dfr genes. A TMP resistance rate in the range of 18-26 % respective to the origin was found in clinical isolates, 23-40 % in isolates from diseased animals and 9-20 % in isolates from healthy animals. Of 112 TMP-resistant isolates, 103 carried at least one of the six dfrA genes (dfrA1, dfrA5, dfrA8, dfrA12, dfrA14 and dfrA17) as determined by multiplex PCR and RFLP. The dfrA1 and dfrA17 genes were found most frequently in clinical isolates (17 and 19 isolates, respectively), whilst dfrA1 and dfrA14 genes dominated in isolates of animal origin (25 and 13 isolates, respectively). The dfrA5, dfrA12 and dfrA8 genes were detected at lower frequencies. The association with class 1/class 2 integrons was confirmed for 73-100 % of dfr genes found in most groups of isolates, except for the isolates from diseased swine. In this group, the majority of dfr-positive isolates (67 %, 8/12) carried dfrA8 (6/12) or dfrA14 genes (2/12) that were not associated with integrons. Non-integron location was also confirmed for the remaining dfrA8 genes (six clinical isolates and one isolate from diseased cattle) and for dfrA14 genes (two isolates from diseased cattle and swine each). All cassette-independent dfrA14 genes were found to be located within the strA gene. This study on the prevalence and distribution of TMP resistance genes among E. coli isolates of human and animal origin in Lithuania demonstrates that dfr genes are carried most frequently as gene cassettes within class 1 and/or class 2 integrons. However, TMP resistance in some of the isolates was found to be mediated by non-integron-associated dfrA8 and dfrA14 genes, indicating the existence of alternative sources for the spread of resistance.

journal_name

J Med Microbiol

authors

Šeputienė V,Povilonis J,Ružauskas M,Pavilonis A,Sužiedėlienė E

doi

10.1099/jmm.0.015008-0

subject

Has Abstract

pub_date

2010-03-01 00:00:00

pages

315-322

issue

Pt 3

eissn

0022-2615

issn

1473-5644

journal_volume

59

pub_type

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