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Vibrio cholerae on agar plate |
Culture of Vibrio cholerae on blood agar. Cultivation 24 hours, at a temperature of 37°C. A strongly hemolytic strain of Vibrio cholerae.
Vibrio cholerae on blood agar
Historically, the classical and El Tor biotypes were differentiated by the ability of the El Tor group to lyse erythrocytes. However, by 1972 almost all El Tor isolates worldwide were nonhemolytic. The two exceptions to this trend have been the U.S. Gulf Coast and the Australia clones of V. cholerae O1, which are strongly hemolytic when assayed by either the plate or tube hemolysis assay. For this reason, hemolysis continues to be a useful phenotypic characteristic for differentiating the Gulf Coast and Australia clones of V cholerae O1 from El Tor strains from the rest of the world, including Latin America.
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Microscopy:
Gram-negative, curved, non-spore-forming rods. |
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