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27 terms

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