Comparative Analysis of the Susceptibility to Triclosan and Three Other Biocides of Avian Salmonella enterica Isolates Collected 1979 through 1994 and 2004 through 2010

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Abstract:

Few studies have been conducted on changes in the susceptibility of bacteria due to long-term use of biocides. A total of 375 avian Salmonella isolates collected in Germany from healthy or diseased animals during two time periods, 1979 through 1994 and 2004 through 2010, were included in the present study. The isolates were tested for their MICs of triclosan, acriflavine, benzalkonium chloride, and chlorhexidine by broth macrodilution. MIC50, MIC90, and the distribution of MICs were compared. The MIC ranges were 0.0625 to 0.5 μg/ml for triclosan, 16 to 256 μg/ml for acriflavine, 8 to 128 μg/ml for benzalkonium chloride, and 0.5 to 32 μg/ml for chlorhexidine. MIC50s and MIC90s were equal or differed by not more than one dilution step. For isolates from healthy poultry collected during the two time periods, statistical analysis revealed a significant increase only in MICs for chlorhexidine. Salmonellae from diseased birds were more susceptible to triclosan and benzalkonium chloride but less susceptible to acriflavine and chlorhexidine. Overall, only 25 strains had the highest detected MIC of 0.5 μg/ml triclosan, but an association with multidrug resistance could not be confirmed.

Document Type: Research Article

DOI: http://dx.doi.org/10.4315/0362-028X.JFP-12-420

Affiliations: 1: Institute for Food Quality and Food Safety, University of Veterinary Medicine Hannover, Foundation, Bischofsholer Damm 15, 30173 Hannover, Germany 2: Institute of Farm Animal Genetics, Friedrich-Loeffler-Institut, Höltystrasse 10, 31535 Neustadt-Mariensee, Germany 3: Federal Office of Consumer Protection and Food Safety, Diedersdorfer Weg 1, 12277 Berlin, Germany 4: Bayer Animal Health GmbH, Alfred Nobel Strasse 50, 40789 Monheim, Germany 5: Institute for Food Quality and Food Safety, University of Veterinary Medicine Hannover, Foundation, Bischofsholer Damm 15, 30173 Hannover, Germany. corinna.kehrenberg@tiho-hannover.de

Publication date: April 1, 2013

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