Atotal of 73 strains of Plesiomonas shigelloides isolated fromhumans (24 strains) animals (21 strains) and aquatic environment (28 strains) were determined for their O:Hserotype and susceptibility to 18 antimicrobial substances and to the vibriostatic agent O/129. Of all strains, 86.3%were typeable by the O and 94.5%by the Hanti-sera used. The serotype distribution was heterogeneous within a country and between the countries. Of the 57 different serotypes identiﬁed, O11:H2 (2 strains), O22:H3 (4 strains), O35:HH11 (2 strains), O52:H3 (2 strains) and O90:H6 (2 strains) were found among isolates from humans and animals (mainly in cats) in Finland and Cuba, and O23:H1a1b (3 strains) among isolates from environmental sources in Slovak Republic and Italy. Most (93–100%) of all strains were susceptible to all antimicrobials tested but resistant (92–96%) to the broad-spectrumpenicillins (ampicillin, mezlocillin). No correlation between anti-microbial resistance patterns and serotypes was found.
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