88 E. coli-K5-strains identified by a K5-phage were serotyped with regard to O- and H-antigens and 19 different O:K5:H-serotypes were registered. Further 11 isolates were rough strains and 2 other strains could not be O-typed. The following frequency of O:K:H-serotypes (number) was determined: O75:K5:H- (21), O18:K5:H- (11), O6:K5:H1 (9), and O18:K5:H1 (6). Seven other O:K:H-serotypes were detected once only. The results of typing are different in dependence of the geographic area and the time of isolation, respectively.
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