Environmental Occurrence and Antibiotic Susceptibility Profile of Listeria monocytogenes at a Slaughterhouse Raw Processing Plant in Romania

Journal of Food Protection
Claudia SalaKálmán Imre

Abstract

This survey was conducted to investigate the occurrence and antimicrobial susceptibility of Listeria monocytogenes isolates in the environment of a pig slaughterhouse raw processing plant complex in western Romania. A total of 97 environmental samples from food contact (n = 60) and nonfood contact (n = 37) surfaces were examined with standard methods. The susceptibility of the isolates to 17 antimicrobial agents was determined with the VITEK 2 automated system. Overall, 25 (25.8%) samples were positive for L. monocytogenes , with recovery rates of 23.3% (n = 14) and 29.7% (n = 11) for food contact and nonfood contact surfaces, respectively. All 25 tested isolates were resistant to benzylpenicillin, imipenem, and fusidic acid. Resistance was observed to oxacillin (23 isolates; 92%), fosfomycin (23 isolates; 92%), clindamycin (22 isolates; 88%), rifampin (14 isolates; 56%), trimethoprim-sulfamethoxazole (12 isolates; 48%), tetracycline (11 isolates; 44%), and ciprofloxacin (1 isolate; 4%). No resistance was found to seven tested agents: gentamicin, moxifloxacin, erythromycin, linezolid, teicoplanin, vancomycin, and tigecycline. All tested L. monocytogenes isolates were resistant to four to nine antimicrobial agents. These results...Continue Reading

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