Abstract:
:Enterobacteriaceae-associated blaCTX-M genes have become globally widespread within the past 30 years. Among isolates from Washington State cattle, Escherichia coli strains carrying blaCTX-M (CTX-M E. coli strains) were absent from a set of 2008 isolates but present in a set of isolates from 2011. On 30 Washington State dairy farms sampled in 2012, CTX-M E. coli prevalence was significantly higher on eastern than on northwestern Washington farms, on farms with more than 3,000 adult cows, and on farms that recently received new animals. The addition of fresh bedding to calf hutches at least weekly and use of residual fly sprays were associated with lower prevalence of CTX-M E. coli. In Washington State, the occurrence of human pathogens carrying blaCTX-M genes preceded the emergence of blaCTX-M-associated E. coli in cattle, indicating that these resistance determinants and/or their bacterial hosts may have emerged in human populations prior to their dissemination to cattle populations.
journal_name
Appl Environ Microbioljournal_title
Applied and environmental microbiologyauthors
Davis MA,Sischo WM,Jones LP,Moore DA,Ahmed S,Short DM,Besser TEdoi
10.1128/AEM.00463-15subject
Has Abstractpub_date
2015-07-01 00:00:00pages
4403-10issue
13eissn
0099-2240issn
1098-5336pii
AEM.00463-15journal_volume
81pub_type
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