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SUMMARY Seven strains of Mycoplasma hyorhinis obtained from different geographic areas were compared by growth-inhibition, metabolism-inhibition and latex-agglutination tests. Although serologically interrelated, the strains showed differences ranging from slight to profound, and therefore division into subtypes was suggested. Statistical analysis by the coefficient of concordance and by the rank correlation coefficient supported the finding that all three sero-logical methods are probably equally suitable for serological differentiation. Polyacrylamide gel electrophoresis revealed no appreciable differences among the strains.
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Góis et al. (1974) studied this question.