Presence of Antibiotic Resistant Enterococci in Rinses of Milking Equipment after Sanitation Process
2023
Miroslav Kročko | Margita Čanigová | Viera Ducková | Anna Krebs-Artimová | Jana Račková
Enterococci are common milk contaminants, and microbial contamination of milk by this group of microorganisms can occur from a variety of sources. Significance of enterococci can be assessed by many separated points of view, otherwise a lot of research has focused on the potential role of food enterococci as reservoirs and/or vehicles of antibiotic resistance. The aim of this investigation was to evaluate the occurence of enterococci in rinses of milking equipment (n = 38) on two farms using automatic sanitation system. Our results showed, that alkaline disinfectant (on chlorine basis) was effective towards enterococci because apart from 2 samples, their presence in rinses has not been determined. Average number of enterococci survived the aplication of acid disinfectant reached the value 5.00.101 CFU.ml-1. Together, 60 strains were randomly isolated and identified from the grown colonies of genus Enterococcus, and E. faecalis was the predominat species (69.6 %). In rinses, also E. faecium, E. mundtii and undefined enterococci were found. Among antibiotic resistant isolates, 83.9 % of isolates were sensitive to erytromycin (15mcg/disk) and resistant to vancomycin (30 mcg/disk) were 20 % of isolates.
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