Genus Coxiella Flashcards
1
Q
Classification
A
Family: Coxiellaceae
Genus: coxiella
Species: C.burnetii
Reservoir: domestic livestock
2
Q
Morphology
A
Gram negative rods
Pleomorphic
Resembles Rickettsia morphologically
Transmission : aerosol
3
Q
Growth characteristics
A
Aerobic
Obligate intracellular parasite
Highly resistant to heat, drying and some disinfectants
4
Q
Virulence factors
A
- no toxins or virulence factors known
5
Q
Disease
A
Q fever:
- headache
- pneumonia
- fever —> differentiate from Brucella (undulating fever)
- hepatitis
FEPHH
Complications (in immunocompromised or previously damaged valves) —> endocarditis
6
Q
Microbiological diagnosis
A
- via serologic tests usually
- Weil-felix test negative
- stain and culture rarely done
7
Q
Treatment and prevention
A
- tetracycline —> normally not given due to self-limiting recovery
Prevention
- killed vaccine for persons in high-risk occupations