A serological study of 23 North American strains of Yersinia ruckeri showed that they were comprised essentially of one serotype–the classical ‘Hager‐man’ serotype. Cross‐protection tests showed that rainbow trout could be protected from challenge with various strains. Continuous surveillance of enteric redmouth disease and further work including DNA binding studies is necessary to determine the precise significance of the other related serotypes.
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McCarthy et al. (1982) studied this question.
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