Difference between salmonella and shigella by biochemical test
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Colonies are bluish-green on Hektoen agar and do not have the black center seen with Salmonella, as Shigella do not produce H2S. Shigella do not ferment lactose and xylose and are relatively inert biochemically. ... Enteroinvasive E. coli are evolutionary intermediates between E. coli and Shigella.
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