E. Coli Flashcards
1
Q
Gram Rxn
A
-
2
Q
Motility
A
Typically motile
3
Q
Growth temp (psychrotrophic/ mesophilic)
A
8 - 48 C (optimum: ~37C)
4
Q
pH for growth
A
4.2 - 9.0
5
Q
aw for growth
A
> 0.96
6
Q
Infectious dose
A
EIEC: 10^6
ETEC: 10^8 - 10^10
7
Q
Onset time
A
EPEC: 12 - 72 hr
EIEC: 8 - 48 hr
ETEC: 24-36 hr
8
Q
Major symptoms
A
Diarrhea, vomiting, fever
9
Q
Foods associated with outbreaks
A
EPEC: Meat pies, raw milk
10
Q
Categories of E. coli
A
- Enteropathogenic (EPEC)
- Enteroinvasive (EIEC)
- Enterotoxigenic (ETEC)
- Enterohemorrhagic (EHEC)
- Enteroadherent (EAEC)
- Enteroaggregative (EaggEC)
11
Q
EPEC
A
- Non-toxigenic / non-invasive strains
- 29 serotypes
12
Q
EIEC
A
- Dysenteric form of diarrhea
- non-motile
- 11 serotypes
13
Q
ETEC
A
- Produces heat-labile (LT) or heat-stable (ST) toxin
- 16 serotypes
