ID Board Review/Bacterial Diseases/Gram-negative Rods (GNR)

Growth on MacConkey Agar

Glucose Fermenting and Oxidase Positive

• Pasteurella spp
• Vibrio Spp
• Aeromonas spp

Glucose Fermenting and Oxidase Negative

• Enterobacteriaceae
  • Lactose non-fermenting
    • Salmonella spp
    • Shigella
    • Yersinia spp
  • Lactose fermenting
    • Escherichia coli
    • Citrobacter spp
    • Klebsiella spp (Anaerobic)
    • Serratia spp

Glucose Non-Fermenting

• Pseudomonas spp
• Stenotrophomonas maltophilia
• Acinetobacter baumannii
• Burkholderia cepacia

No Grow on MacConkey Agar

• Bartonella henselae
• Bordetella spp
• Brucella
• Campylobacter spp
• Capnocytophaga spp
• Francisella spp
• Haemophilus spp
• Helicobacter spp
• Legionella spp
• Streptobacillus moniliformis

Obligate Anaerobic GNR

• Bacteroides spp

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Alternative GNR Classifications

Curved GNRs

• Vibrio cholerae
• Campylobacter jejuni
• Helicobacter spp