Characterization of isolates of monophasic Salmonella enterica serovar Typhimurium
2017
Roasto, M., Estonian Univ. of Life Sciences,Tartu (Estonia). Inst. of Veterinary Medicine and Animal Sciences. Chair of Food Hygiene and Veterinary Public Health | Kramarenko, T., Veterinary and Food Lab., Tartu (Estonia) | .
The main aim of the present work was to characterize monophasic Salmonella enterica serovar Typhimurium isolated from food and patients in 2015-2016 in Estonia. Also, the distribution of other prevailing Salmonella serovars in Estonia is presented including longer period (2012-2016). During five years the most prevailing Salmonella serovars isolated from food were S. Derby, S. Typhimurium (incl. monophasic) and S. Isangi with the prevalence of 21.7%, 18.2% and 11.4%, respectively. During the same period the most often isolated Salmonella serovars in human patients were S. Enteritidis, S. Typhimurium (incl. monophasic) and S. Infantis with the prevalence of 44.6%, 20.3% and 14.7%. During five year study period, in food S. Typhimurium and its monophasic variants were isolated in 97 cases wherein monophasic strains of those were 66.0%. In human patients altogether 212 S. Typhimurium and its monophasic variants were isolated, and monophasic strains of those were 19,3%. Similarly to many other countries the prevalence on monophasic S. Typhimurium has been raised during last years both in food and among human patients. All analysed monophasic S. Typhimurium isolates of human origin from 2015 and 2016 (n = 10) were simultaneously resistant against ampisillin, tetracycline, streptomycin and sulfamethoxasole. One isolate of them was multiresistant against 9 antimicrobials. Monophasic S. Typhimurium isolates of food chain origin from 2015 and 2016 (n = 32) showed resistance mostly against ampicillin (n = 28), sulfamethoxasole (n = 27) and tetracycline (n = 24). Multiresistance was determined for 24 isolates of food chain origin. Altogether seven PFGE clusters were revealed among human and food chain monophasic S. Typhimurium isolates, and two clusters shared both human and food isolates.
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