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  • Title: Plasmid profiles as an epidemiological marker in Salmonella enterica serovar berta infections. Comparison of isolates obtained from humans and poultry.
    Author: Olsen JE, Sørensen M, Brown DJ, Gaarslev K, Bisgaard M.
    Journal: APMIS; 1992 Mar; 100(3):221-8. PubMed ID: 1562315.
    Abstract:
    Plasmid profiles of 674 Salmonella berta strains isolated in the period 1985-1989 from 674 cases of human infections were recorded. Five hundred and eighty-nine of the strains examined (87.4%) contained plasmids and the mean number of plasmids was 1.8 per strain. Sixteen different plasmid sizes were recognized, 13 of which had also been reported from S. berta of poultry origin. The plasmids formed 90 different profiles. Forty-five of these profiles, comprising 90.7% of isolates, had previously been recorded among poultry strains. Only 12 human isolates (1.8%) carried plasmids which were not demonstrated among isolates obtained from broilers. The prevalences of the 20 most commonly demonstrated profiles were not significantly different among isolates obtained from humans and broilers. The average difference between the prevalences of individual plasmid profiles was 2.1, with a standard deviation of 4.2. Based on the results, indications are that broilers represent the main reservoir for human S. berta infections in Denmark.
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