<prompt> Which of the following is a true statement regarding Enterobacteriaceae:Motility is by polar flagellumGlucose is not fermented by all members of the familyAll members are oxidase positiveNitrate reduction negative  <response>: Ans. c Shigella does not ferments mannitol Members of enterobacteriaceae rcduce nitrates to nitrites, form catalase but not oxidase. Enterobacteriaceae: lmpoant features Features Escherichia Salmonella Shigella Motility by peritrichous flagella - Gas from glucose - Acid from lactose - - Acid from sucrose d - - Growth in KCN - d - lndole - d MRAVP Citrate - - H2S - - Urease - - - Phenylalanine deaminase PPA - - - Arginine dehydrolase d - Lysine decarboxylase - Omithine decarboxylase d d d result different in different species or strains Remember: - Polar flagella: Vibrio, pseudomonas, legionella, spirilla, campylobacter, H. pylon, spirochetes. - V. parahemolytic produce both polar and peritrichous flagella. 