Abstract:
:This study describes the genotypic characteristics of a collection of 100 multidrug-resistant (MDR) Escherichia coli strains recovered from cattle and the farm environment in Ireland in 2007. The most prevalent antimicrobial resistance identified was to streptomycin (100%), followed by tetracycline (99%), sulfonamides (98%), ampicillin (82%), and neomycin (62%). Resistance was mediated predominantly by strA-strB (92%), tetA (67%), sul2 (90%), bla(TEM) (79%), and aphA1 (63%) gene markers, respectively. Twenty-seven isolates harbored a class 1 integrase (intI1), while qacEΔ1 and sul1 markers were identified in 25 and 26 isolates, respectively. The variable regions of these integrons contained aminoglycoside, trimethoprim, and β-lactam resistance determinants (aadA12, aadB-aadA1, bla(OXA-30)-aadA1, dfrA1-aadA1, dfrA7). Class 2 integrons were identified less frequently (4%) and contained the gene cassette array dfrA1-sat1-aadA1. Resistance to ampicillin, neomycin, streptomycin, sulfonamide, and tetracycline was associated with transferable high-molecular-weight plasmids, as demonstrated by conjugation assays. A panel of virulence markers was screened for by PCR, and genes identified included vt1, K5 in 2 isolates, papC in 10 isolates, and PAI IV(536) in 37 isolates. MDR commensal E. coli isolates from Irish cattle displayed considerable diversity with respect to the genes identified. Our findings highlight the importance of the commensal microflora of food-producing animals as a reservoir of transferable MDR.
journal_name
Appl Environ Microbioljournal_title
Applied and environmental microbiologyauthors
Karczmarczyk M,Walsh C,Slowey R,Leonard N,Fanning Sdoi
10.1128/AEM.00601-11subject
Has Abstractpub_date
2011-10-01 00:00:00pages
7121-7issue
20eissn
0099-2240issn
1098-5336pii
AEM.00601-11journal_volume
77pub_type
杂志文章abstract::Clostridium difficile causes a potentially fatal diarrheal disease through the production of its principal virulence factors, toxin A and toxin B. The tcdC gene is thought to encode a negative regulator of toxin production. Therefore, increased toxin production, and hence increased virulence, is often inferred in stra...
journal_title:Applied and environmental microbiology
pub_type: 杂志文章
doi:10.1128/AEM.00249-12
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journal_title:Applied and environmental microbiology
pub_type: 杂志文章
doi:10.1128/AEM.59.3.763-771.1993
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abstract::Since 2006, Geomyces destructans, the causative agent of white nose syndrome (WNS), has killed over 5.7 million bats in North America. The current hypothesis suggests that this novel fungus is an invasive species from Europe, but little is known about the diversity within the genus Geomyces and its distribution on bat...
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journal_title:Applied and environmental microbiology
pub_type: 杂志文章
doi:10.1128/AEM.56.10.3117-3124.1990
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journal_title:Applied and environmental microbiology
pub_type: 杂志文章
doi:10.1128/AEM.56.6.1516-1517.1990
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doi:10.1128/AEM.00715-09
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pub_type: 杂志文章
doi:10.1128/AEM.54.9.2192-2196.1988
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pub_type: 杂志文章
doi:10.1128/AEM.50.1.45-48.1985
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pub_type: 杂志文章
doi:10.1128/AEM.64.6.2166-2172.1998
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journal_title:Applied and environmental microbiology
pub_type: 杂志文章
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abstract::Two isolates of enterohemorrhagic Escherichia coli (EHEC) O104:H4 were isolated in France in 2004 and 2009. Both were characterized and compared to the strain which caused the German outbreak in 2011 and to other O104:H4 strains. This suggests that different O104:H4 EHEC strains were present several years prior to the...
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journal_title:Applied and environmental microbiology
pub_type: 杂志文章
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journal_title:Applied and environmental microbiology
pub_type: 杂志文章
doi:10.1128/AEM.46.5.1234-1235.1983
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journal_title:Applied and environmental microbiology
pub_type: 杂志文章
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journal_title:Applied and environmental microbiology
pub_type: 杂志文章
doi:10.1128/AEM.58.1.431-433.1992
更新日期:1992-01-01 00:00:00
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pub_type: 杂志文章
doi:10.1128/AEM.00625-07
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