Antimicrobial resistance of <I>Salmonella</I> isolates recovered from animal products

Abstract

The article provides data on antimicrobial resistance (AMR) of Salmonella isolates recovered from animal products tested in the Laboratory for Microbiological Testing of the FGBI “ARRIAH” from 2019 to 2020. 106 isolates of Salmonella enterica subsp. Enterica were recovered from 4,500 tested samples of raw materials and products of animal origin, 23% of them wereuntyped, and 77% belonged to 17 serological variants. Isolates of S. enteritidis (n = 37) and S. virchow (n = 9) serovariants dominated among the typed cultures of Salmonella, which is consistent with the data from other authors. Antimicrobial susceptibility of the microorganisms was determined in a disk diffusion test in accordance with the recommendations of the European Committee on Antimicrobial Susceptibility Testing. Different Salmonella serovars demonstrated different proportions of susceptible and resistant isolates, in terms of antibiotics from ten pharmacological groups. The largest number of polyresistant isolates was noted in Salmonella serovars S. virchow, S. nigeria, S. infantis, S. colindale. Both resistant and polyresistant Salmonella isolates were most often isolated from poultry products. S. typhimurium serovar, which is referred to in literature as polyresistant, was resistant to one or two antimicrobial agents as the research demonstrates. Isolates of 9 Salmonella serovars out of 17 (65%) showed resistance to nalidixic acid. 97% (n = 36) of S. enteritid isisolates were resistant to this antimicrobial agent. Isolates of S. Colindale serovar (n = 2) were resistant to 8 antimicrobials, S. papuana (n = 5) – to 6 antibiotics, and S. agona (n = 3) – to 5 antimicrobials. Untyped Salmonella isolates were resistant to 9 antibiotics, 2 cultures out of them showed resistance to ciprofloxacin.

Keywords

• salmonella
• serovariant
• antibiotic
• susceptibility
• resistance