Serotyping is probably the most widely used method for typing strains of , but the range of antisera required restricts its use to a few specialised laboratories. Other typing methods are available, and the purposes of this investigation were to evaluate the techniques of biotyping (Crichton and Old, 1979), resistotyping (Elek and Higney, 1970) and haemagglutinin typing (Duguid, Anderson and Campbell, 1966; Duguid, Clegg and Wilson, 1979), to assess their convenience for use in routine diagnostic laboratories, and to determine whether combinations of these methods would lead to more precise identification of sequential isolates of from patients with urinary-tract infections.


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