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Differentiation of Mannheimia haemolytica genotype 1 and 2 strains by visible phenotypic characteristics on solid
Emily L Wynn1, Gennie Schuller1, John D Loy2
1United States Department of Agriculture, Agricultural Research Service, U.S. Meat Animal Research Center, Clay Center, NE, USA.
Abstract:
Genotype 2 Mannheimia haemolytica associate with the lungs of cattle with bovine respiratory disease more frequently than genotype 1 strains. Different colony colors and morphologies were identified between genotype 1 and 2 solid media cultures. Genotype of strains, and frequency differences between them in mixed cultures are discernable by visual inspection.
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