Transmission of Salmonella enterica serotype Typhimurium in poultry with and without antimicrobial selective pressure.

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 Microbiol

authors

Bauer-Garland J,Frye JG,Gray JT,Berrang ME,Harrison MA,Fedorka-Cray PJ

doi

10.1111/j.1365-2672.2006.03036.x

subject

Has Abstract

pub_date

2006-12-01 00:00:00

pages

1301-8

issue

6

eissn

1364-5072

issn

1365-2672

pii

JAM3036

journal_volume

101

pub_type

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