Lower GI Micro Flashcards by Robbie Gruhl

S. aureus food poisoning

timeline

1-7 hr after, diarrhea for 1-3 days

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Bacillus cereus

where is it found

cooked rice

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Bacillus cereus

types and etiologies

emetic: cereulide enterotoxin forms pores
diarrheal: excessive fluid secretion

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Clostirium boulinum

infection routes

foodborne (ingesting toxin)–canned foods
wound (toxin generated in wound)
infant (ingestion of spores)–honey

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Botulinum neurotoxin effect

zinc-dependent proteolysis of SNARE proteins

muscle weakness and paralysis

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Bacteria
Gram +
Large bacilli
Endospore-forming
Facultative anaerobe
Mostly motile
β-hemolytic

Bacillus cereus

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Bacteria
Gram +
Bacilli
Spore-forming
Obligate anaerobe
Motile

Clostridium botulinum

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Bacteria
Gram +
bacilli
spore-forming
obligate anaerobe
non-motile

C. perfringes

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Bacteria
Gram -
bacilli (spirilli)
microaerophilic
motile
cold-sensitive

Campylobacter jejuni

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Bacteria
Gram -
bacilli
non-spore forming
H2S + and lactose -
motile, flagellated

Salmonella enterica

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Clostridium perfringes

diarrhea w/o fever or vomitting for

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Campylobacter jejuni

diarrhea, fever

possibly vomitting, bloody diarrhea

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Complication of Campylobacter

Guillain-Barré

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Karmali agar

Campylobacter jejuni

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Campylobacter jejuni

harbored in

poultry

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Clostridium perfringes

harbored in

cafeteria

Salmonella enterica

diarrhea, fever

Complication of Salmonella

reactive arthritis

Reservoirs for Salmonella

dairy, eggs, veggies

Bacteria
Gram -
vibrio (curved rod)
factultative anerobes
flagellated, mobile
oxidase +
vibrio ssp

Vibrio spp

Bacteria
Gram +
bacillus
non-fastidious*
flagellated
non-spore forming
oxidase -

Listeria monocytogenes

Bacteria
Gram -
bacillus
facultative anaerobe
non-motile
non-spore forming
mainly lactose -, H2S -

Shigella spp

Bacteria
Gram -
bacillus
facultative anaerobe
motile
non-spore forming
mainly lactose +

E. coli

Stain for vibrio

Kovacs oxidase reagent

turns purple

Sx of vibrio

mild bloody diarrhea fever nausea, vomiting

Vibrio reservoirs

fish

Listeria Sx

fever, mild GI, muscle ache or stiff neck

Shigella Sx

bloody diarrhea | fever

What causes bacterial dysentery

shigella

Complications of shigella

``` HUS (hemolytic uremic syndrome) reactive arthritis (flexnori) ```

Cholera toxin

Vibrio cholerae | activate adenylate cyclase --> Cl- and water

Typhoid fever Sx

high fever weakness and headache diarrhea or constipation