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Test results of Salmonella sero- and phage typing by the National Reference Laboratories and the EnterNet laboratories in the Member States of the European Union

The fourth collaborative study on serotyping and phage typing for Salmonella was organised by the Community Reference Laboratory in collaboration with the Public Health Laboratory Services. All the National Reference Laboratories for Salmonella and 12 EnterNet laboratories participated in the study. In total, 16 strains of the species Salmonella enterica were selected for serotyping, while 10 strains of Salmonella Typhimurium and 10 strains of Salmonella Enteritidis were selected for phage typing. In general, problems with the typing of the O antigens did not occur. Most problems occurred with the typing of the H antigens. The majority of the EnterNet Laboratories and National Reference Laboratories did not encounter major problems with the phage typing of STM and SE strains.