Rickettsiceae

Question 1

Habitat

Answer 1

OBLIGATE CELL PARASITES
Arthropod vectors
Small rodents

Question 2

Morphology

Answer 2

Non motile, small coccoid rods

Question 3

Staining

Answer 3

Difficult , Giemsa , köster , stamp

Question 4

Culture

Answer 4

Living cells, embryonated eggs , cell cultures , animals

Cannot produce NAD , CoA itself

Question 5

Genera

Answer 5

Rickettsia , coxiella : all cell type
Neorickettsia , Ehrlicha ; lymphoid + endothelial cells
Anaplasma; ON erythrocyte , in lymphoid.

Question 6

Rickettsia

Answer 6

Rodents, arthropods
Giemsa
1. R. Prowazekii: epidemic typhus fever (lice) rush (defecation>scratching> blood stream
2. R. Rickettsi: Rocky mountain disease (ticks)
3. Sibirica: North Asian tick brome rickettsiosis

Question 7

Coxiella

Answer 7

V Good resistance , embryonated egg , not by tick but spores in aerosol
C. Brunetti: cattle,sheep,goat- Q fever- pneumonia , fever, hepatitis, no rash

Question 8

Bartonella

Answer 8

Not from rickettsiacaea, but same topic as coxiella
Slightly curved rod, BLOOD agar (3-4w)
B. Henselae: cat scratch disease - ulcer,fever, headache , enlarged LN

Question 9

Ehrlichia

Answer 9

Coccoid , CANNOT be cultured in embryonated egg
Tissue culture
RBCs parasite

1. E. Canis; canine monocytic ehrlichosis (generlized fever)
2. E. Ruminantium : Ru heartwater
3. Neorickettsia risticii: potomac horse fever

Question 10

Anaplasma

Answer 10

TICK, RUMINANTS , NO cell wall
No possible to culture in VITRO (no cell wall)
RBCs obligatory IC parasite

NON-HAEMOLYTIC ANEMIA
A. Marginale- cattle anaplasmosis
A. Ovis
A. Phagocytophilum - Ru , tickbrone fever

Question 11

Anaplasma

Answer 11

TICK, RUMINANTS , NO cell wall
No possible to culture in VITRO (no cell wall)
RBCs obligatory IC parasite

NON-HAEMOLYTIC ANEMIA
A. Marginale- cattle anaplasmosis
A. Ovis
A. Phagocytophilum - Ru , tickbrone fever