Listeria Flashcards
1
Q
Gram rxn
A
+
2
Q
Morphology/spores
A
Non spore former
3
Q
Motility
A
tumbling motility, peritrichous flagella at 20-25C
4
Q
Aerobic/anaerobic
A
Facultatively Anaerobic
5
Q
Growth temp
A
Psychrotropic
-0.4 - 48C
6
Q
pH for growth
A
4.2 - 9.6
7
Q
aw for growth
A
> 0.92
8
Q
salt tolerance
A
10% NaCl
9
Q
infectious dose
A
> 100 CFU/g
10
Q
susceptible individuals
A
Neonates
Elderly
Pregnant women
Immunocompromised adults
11
Q
onset time
A
3 - 70 days (long incubation period)
12
Q
Major symptoms
A
Pregnant women: flu-like symptoms in 3rd trimester
spontaneous abortion
fetal death
meningitis
13
Q
Foods associated w/ outbreaks
A
fresh produce: raw milk, domestic cheese (Mexican), Ice cream
fish/seafood: shrimp, smoked mussels, smoked fish, cooked crab
Deli Meat!
