Characterization ofSalmonella virchowphage types by plasmid profile and IS200distribution

摘要

The type strains of the 57 phage types ofSalmonella virchowhave been characterized by plasmid profile and by distribution of the insertion sequence IS200. Thirty‐two strains carried plasmids and 21 profile types were identified; 17 strains were resistant to antimicrobial agents. In contrast only six of the type strains carried IS200elements and three patterns were identified. Within Salm. virchow phage type 31, five of 10 wild‐type isolates carried plasmids and two plasmid profiles were identified; in contrast, an IS200element was identified in the genome of only one of these strains. It is concluded that forSalm. virchow, IS200is unlikely to significantly extend the degree of discrimination achieved by phage typing which may be supplemented when appropriate by plasmid profile typ