<prompt> Catalase negative member of the family Enterobacteriaceae is NOT RELATEDSalmonella typhiProteus vulgarisShigella dysenteriae serotype 1Escherichia coli  <response>: 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. 