Gram Negative Aerobic Bacteria

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Enterobacteriaceae

Gram-negative bacilli. Glucose-fermenting. Oxidase negative. Normal inhibitants of intestine

Escherichia coli (E.coli)

Gram-negative bacilli. Lactose fermenter. Motile. Infeciton: EHEC (O157:H7),neonatal meningitis, UTI

Klebsiella pneumoniae

Gram-negative bacilli. Lactose fermenter. Non-motile. Capsule (mucoid colonies on MacConkey).

Enterobacter

Gram-negative bacilli. Motile. Lactose fermenter. Species: E. aerogenes, E. cloacae

Serratia marcescens

Gram-negative bacilli. Motile. Non-lactose fermenter. Produces red pigment

Citrobacter

Gram-negative bacilli. Motile. Non-lactose fermenter. Species: C. freundii

Enterobacter, Serratia, Citrobacter (Infection)

Resistance to multiple antibiotics. Hospital outbreaks

Proteus

Gram-negative bacilli. Non-lactose fermenter. Swarm on agar. Hydrolyze urea. Infection: UTI, associated with renal stones. Species: P. mirabilis, P. vulgaris

Shigella

Gram-negative bacilli. Non-motile. - Non-lactose fermenter. Infection: Bacillary Dystentery. Species: S. dystenteriae, S. flexneri, S. boydii, S. sonnei

Salmonella

Gram-negative bacilli. Motile. Non-lactose fermenter. Infection: Gastroenteritis, Enteric fever (S. typhi, S. paratyphi A,B,C)

Pseudomonas aeruginosa

Gram-negative bacilli. Motile. Non-lactose fermenter. Oxidase positive. Obligate aerobe. Produces green pigment. Infection: hospital acquired infection

Acinetobacter

Gram-negative coccobacill. Non-motile. Non-lactose fermenter. Infection: hospital acquired infection

Vibrio

Gram-negative curved rods. Motile (single flgellum). Halophilic. Oxidase/Catalse positive. Glucose fermenter. Sucrose fermentation. TCBS agar: V. cholerae (Yellow: sucrose +), V. haemolyticus (Green: sucrose -)

Vibrio cholerae (Infection)

Cholera. Contaminated food. Fecal-oral route. Yellow on TCBS agar

Vibrio parahaemolyticus (Infection)

Gastroenteritis. Green on TCBS agar

Vibrio vulnificus

Necrotizing fascitis

Campylobacter

Curved seagull shaped. Grown at 42oC. Microaerophilic (15% oxygen). Teardrop colonies on Skirrow medium (black). Oxidase positive. Infection: Gastroenteritis

Helicobacter pylori

Spiral S-shaped. Microaerophilic. Urease positive (live in pH 2). Infection: peptic ulcer

Haemophilus influenze

Cocobacilli. 5% CO2 supplement. Requires X factor (haemin) and V factor (NAD) for growth on choclate agar. Satellitism with S. aureus

Legionella pneumophilia

5% CO2. BCYE agar. Infection: Legionnaire's disease. Atypical pneumonia

Bordetella pertussis

Bordet-Gengou agar. Infection: Pertussis

Brucella

Gram-negative bacilli. Disease in farm animals. Acquired through contaminated food product, contact. Infection: Bacteremia

Yersinia pestis

Enterobacteriaceae. In rodents. Infection: Black Death

Neisseria

Kidney bean shaped. Diplococci. CO2 supplement

Neisseria gonorrhoeae (Gonococcus)

Glucose fermenter. Grown on New York City agar. Oxidase/Catalase positive. Infection: Gonorrhoea, Neonatal conjunctivitis

Neiseeria meningitidis (Meningococcus)

Glucose & maltose fermenter. Infection: Meningitis, bacteremia

Moraxella catarrhalis

Coccobacilli. Infection: Bronchitis. Otitis media in children

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