Gram Negative Rods Flashcards
Bordet-Gengou agar, whooping cough
Bordetella pertussis
Poorly gram staining, silver stain, charcoal yeast agar, airconditioning
Legionella pneumophilia
Satellite phenomenon around S. Aureus
H. Influenzae
- Most common cause of acute epiglottitis
2. Treatment for epiglottitis
- H. Influenzae
2. Ceftriaxone
Damages ciliated cells; causes whooping
Tracheal cytotoxin (bordetella pertussis)
Stage of pertussis where bacterial load is highest
Catarrhal stage
Stage of pertussis where whooping is observed
Paroxysmal stage
Stage of pertussis where complications develop (pneumonia, seizures, encephalopathy)
Convalescent stage
Enriched chocolate agar, polyribitol phosphate capsule
Hemophilus influenza type B
Transmission via environmental water source; person to person transmission does not occur
Legionella pneumophila
Endotoxin is the sole virulence factor; cell replicates intracellularly
Legionella
Pontiac fever
Legionella
Atypical pneumonia with electrolyte imbalance (diarrhea, hyponatremia, proteinuria, confusion)
Legionella
Lactose fermenter, urease positive, produces a green/metallic sheen on EMB
E. Coli
Lactose fermenter, urease positive, ESBL
Klebsiella pneumoniae
Comma shaped, microaerophilic, skirrow’s agar
Campylobacter jejuni
Comma shaped, urease positive, skirrow’s agar
Helicobacter pylori
Motile, oxidase negative, H2S producer, nonlactose fermenting
Salmonella
Nonmotile, oxidase negative, H2S nonproducer, nonlactose fermenter
Shigella
Swarming, oxidase negative, H2S producer, urease positive
Proteus mirabilis
- Causative organism of Struvite stones
2. Composition of struvite
- Proteus mirabilis
2. Magnesium, ammonium, phosphate
Oxidase positive, H2S nonproducer, obligate aerobe
Pseudomonas aeruginosa
Causes watery diarrhea in E. Coli infection
HST and HLT toxins
Causes bloody diarrhea in E. Coli infection
Shiga-like verotoxin
Virulence factors: H antigen (flagellum), K antigen (capsule), O/somatic antigen (endotoxin), enterotoxins
E. Coli
Traveler’s diarrhea
ETEC
Watery diarrhea in children and developing countries
EPEC
Bloody diarrhea; can cause HUS
EHEC/STEC