Abstract
All broiler flocks reared and slaughtered in Norway from May-October 2016 (n = 2110) were screened for the presence of extended-spectrum cephalosporin (ESC) -resistant Enterobacteriaceae. Furthermore, we investigated possible risk factors for occurrence of such bacteria in broiler flocks. The odds of a flock being positive for ESC-resistant Enterobacteriaceae increased if the previous flock in the same house was positive, and if the flock was reared during September-October. However, we cannot exclude seasonal fluctuations in occurrence of ESC-resistant Enterobacteriaceae during the months November to April. The overall occurrence of ESC-resistant Enterobacteriaceae was 10.4%, and primarily linked to the presence of blaCMY (82.6%) in positive isolates. We describe the first findings of Escherichia coli with blaCTX-M-1, Klebsiella pneumoniae with both blaCTX-M-15 and blaSHV-12, and K. pneumoniae with blaCMY isolated from Norwegian broiler production. This study gives us a unique overview and estimate of the true occurrence of ESC-resistant Enterobacteriaceae in Norwegian broilers over a six-month period. To the best of our knowledge, this is the most comprehensive study performed on the occurrence of ESC-resistant Enterobacteriaceae in a broiler population.
Highlights
Since the first description of Escherichia coli (E. coli) from broilers displaying resistance towards extended-spectrum cephalosporins (ESC) in 2000–2001 [1], numerous studies have underlined the global distribution of ESC-resistant Enterobacteriaceae in broiler production [2,3,4,5,6,7]
We assessed possible risk factors for occurrence of ESC-resistant Enterobacteriaceae in Norwegian broiler flocks using the census population of all broiler flocks reared during the study period from May-October 2016
To the best of our knowledge, this is the most comprehensive study performed on the occurrence of ESC-resistant Enterobacteriaceae in broiler flocks and possible risk factors associated with such resistance
Summary
Since the first description of Escherichia coli (E. coli) from broilers displaying resistance towards extended-spectrum cephalosporins (ESC) in 2000–2001 [1], numerous studies have underlined the global distribution of ESC-resistant Enterobacteriaceae in broiler production [2,3,4,5,6,7]. In Norway, the first ESC-resistant E. coli isolated from food-producing animals was found in the intestinal flora of healthy broilers in 2006 [8, 9]. Extended-spectrum cephalosporin-resistant Enterobacteriaceae in Norwegian broilers the manuscript. There was no additional external funding received for this study
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