Catalase negative member of the family Enterobacteriaceae is (NOT RELATED)
The general finding that members of the family enterobacteriaceae produce catalase has impoant exceptions in Shigella dysenteriae serotype 1 and a few strains of Shigella flexneri (mostly in serotype 4a) which are catalase negative.
Salmonella typhi
Proteus vulgaris
Shigella dysenteriae serotype 1
Escherichia coli
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