Microcheck 104

Strains of a given species may differ in phenotypic attributes such as biochemical capabilities, protein and polysaccharide components, susceptibility to bacteriophages, and sensitivity to antimicrobial drugs. Molecular techniques can be used to detect subtle genomic differences between strains that are phenotypically identical.

■ Explain the difference between a biotype and serotype.

■ Describe the technique of ribotyping.

■ What observations would you expect when E. coli O157:H7 is cultured on a medium containing sorbitol and a pH indicator?

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