82. Genera Ehrlichia and Anaplasma.

Question 1

Anaplasma Habitats Culture and Pathogenecity?

Answer 1

ANAPLASMA genus
Habitat
• ticks, ruminants
Culture
• in vitro: not possible, no cell wall
Pathogenicity
• A. marginale: cattle anaplasmosis (anaemia), tropical and
subtropical countries
• A. ovis: sheep, goat anaplasmosis (anaemia)
• A. phagocytophilum: tickborne fever of ruminants, equine
granulocytic ehrlichiosis (oedema, lymphadenopathy)

Question 2

Ehrlichia and Neorickettsia Morphology Culture and Pathogenecity?

Answer 2

EHRLICHIA and NEORICKETTSIA genus
Morphology
• coccoid
Culture
• tissue cultures
• cannot be cultured in embryonated eggs
Pathogenicity
• E. canis: canine monocytic ehrlichiosis (fever, generalised)
• E. ruminantium: heartwater of ruminants
• Neorickettsia risticii: Potomac horse fever (N-America, Europe)