Abstract:
AIMS:To determine the effect of antimicrobial selective pressure on the transmission of antimicrobial resistant and sensitive strains of Salmonella in poultry. METHODS AND RESULTS:Eight pens housed 12 broiler chicks each. Two chicks in four of the pens were inoculated with a Salm. Typhimurium strain resistant to 12 antimicrobials (including tetracycline), and two chicks in each of the four other pens were inoculated with a strain sensitive to all antimicrobials tested. Two pens inoculated with each strain were treated with chlortetracycline and two were not. Chicks were killed on day 7 and caeca were cultured for Salmonella. Experiments were performed independently twice. Chicks exposed to pen mates inoculated with the resistant strain and treated with tetracycline were 90% positive for Salmonella; whereas 60% of chicks given no antimicrobials were positive. Chicks exposed to the sensitive strain were 95% positive with tetracycline treatment and 90% positive without treatment. CONCLUSIONS:A multidrug-resistant Salm. Typhimurium strain had significantly increased transmission when chicks were treated with tetracycline. Transmission of a sensitive strain was not inhibited by antimicrobial selective pressure at recommended therapeutic dose. SIGNIFICANCE AND IMPACT OF THE STUDY:This study demonstrates that antimicrobial usage may influence the transmission of antimicrobial-resistant pathogens in poultry.
journal_name
J Appl Microbioljournal_title
Journal of applied microbiologyauthors
Bauer-Garland J,Frye JG,Gray JT,Berrang ME,Harrison MA,Fedorka-Cray PJdoi
10.1111/j.1365-2672.2006.03036.xsubject
Has Abstractpub_date
2006-12-01 00:00:00pages
1301-8issue
6eissn
1364-5072issn
1365-2672pii
JAM3036journal_volume
101pub_type
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