Det anbefales at fagtype mindst ét isolat af S. enteritidis og S. typhimurium fra hver positiv prøve efter den protokol, der er fastlagt af Health Protection Agency (HPA), Colindale, London.
For S. Enteritidis and S. Typhimurium it is recommended that at least one isolate from each positive sample shall be phage typed, using the protocol defined by the Health Protection Agency (HPA), Colindale, London.