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enterobacteria coliforms, mackoncy, ss suger, Citrobacter—These bacteria…

- - - - other species
- - - - Some strains of E coli produce hemolysis on blood agar
      - Lactose positive
  - - - The green colonies with a black center
- - - - nonmotile
      - not ferment lactose
      - producing acid but not gas
        
        do not produce H2S
    - - swarming" on Solid agar; urea rapidly hydrolyzed (smell of ammonia)
        
        Providencia species usually are urease-negative
        
        mirabilis
        
        susceptible to antimicrobial drugs
      - potassium cyanide medium (KCN),
      - ferment xylose.
      - deaminate phenylalanine
      - motile
        
        peritrichous flagella, resulting in "swarming"
        
        phenylethyl alcohol or CLED (cystinelactose-electrolyte-deficient) medium
    - - motile rods
      - ferment glucose and mannose
        
        do not ferment lactose or sucrose
      - without producing gas
  - - - flat, nonviscous colonies
        
        indole, lysine decarboxylase
        
        mannitol fermentation and produces gas from glucose
        
        iridescent "sheen" on differential media such as EMB agar,
        
        negative oxidase
      - isolate from urine
      - hemolysis on blood agar,
      - positive for -glucuronidase using the substrate 4methylumbelliferyl- -glucuronide (MUG).
    - - very viscous, mucoid growth; nonmotile larg capsules
      - positive tests for lysine decarboxylase and citrate
      - produce gas from glucose
      - give positive Voges-Proskauer reactions
      - ornithine decarboxylase and gelatinase
- - - - E coli strains producing K1
        
        attachment
      - Klebsiellae
        
        identified by capsular swelling tests with specific antisera.
      - infections of the respiratory tract
        
        types 1 and 2;
      - urinary tract, by types 8, 9, 10, and 24
        
        infection
  - - - mainly IgG.
      - may interfere with agglutination by anti-O antibody