Disinfectant and Antimicrobial Susceptibility Profiles of Salmonella Strains from Feedlot Water-Sprinkled Cattle: Hides and Feces

Ross C. Beier, Todd R. Callaway, Kathleen Andrews, Toni L. Poole, Tawni L. Crippen, Robin C. Anderson and David J. Nisbet
 

Abstract

The disinfectant and antimicrobial susceptibility profiles of 145 Salmonella strains obtained from feedlot water-sprinkled cattle were determined. A low prevalence of antimicrobial resistance (AMR) was observed, resistance was primarily observed to streptomycin (29.7%) and sulfamethoxazole (8.3%). All strains were susceptible to the 8 fluoroquinolones tested. The most common AMR traits were streptomycin resistance in serovar Kentucky, sulfamethoxazole resistance in Muenster and Cerro and amoxicillin/clavulanic acid-ceftiofur resistance in Meleagridis. Salmonella were more resistant to the disinfectants P-I, DC&R and Tek-Trol and disinfectant component THN than to other disinfectants. All strains were susceptible to triclosan, and all strains were resistant to chlorhexidine. Nearly 1/3 of the strains had low level resistance to benzalkonium chloride. The benzyl ammonium chlorides (BACs) C12, C14 and C16 were the most active ingredient in the disinfectant DC&R. C14BAC and C16BAC were shown to be more active as a disinfectant than was C12BAC. Didecyldimethyl ammonium chloride (C10AC) was the most active ingredient in the disinfectant P-128, and the most active ammonium chloride in this work and in all of our previous studies. No cross-resistance was observed. All manufacturer recommended application levels were above the observed MICs. However, observed MICs for DC&R and Tek-Trol were close to the suggested application rates and a small error in the disinfectant dilution could easily render these disinfects non-functional. The continued use of THN and formaldehyde in DC&R is questionable because these components are not effective, and their inclusion results only in additional unwanted chemicals in the environment.

Published on: May 05, 2017
doi: 10.17756/jfcn.2017-037
Citation:  Beier RC, Callaway TR, Andrews K, Poole TL, Crippen TL, et al. 2017. Disinfectant and Antimicrobial Susceptibility Profiles of Salmonella Strains from Feedlot Water-Sprinkled Cattle: Hides and Feces. J Food Chem Nanotechnol 3(2): 50-59.
 
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