Lab 10- Rickettsia Flashcards
Rickettsiaceae family
Coxiella genus Ehrlichia genus Rickettsia genus Neorickettsia genus Anaplasmataceae family
Anaplasmataceae family (no cell wall) species
A. Marginale A. Centrale A. Bovis A. Ovis A. Phagocytophilum
Habitat
Obligate cell parasites, arthropod vectors, small rodents
Morphology
0.3-0.8 um coccoid rods, non motile
Staining
Difficult
Giemsa
Culture
Living cells
Embryonated eggs, cell culture, animals
Rickettsia genus habitat
Rodents and arthropods
Rickettsia genus species
R. Prowazekii : epidemic typhus fever
R. Rickettsii : Rocky Mountain spotted fever
R. Sibirica : north Asian tick born fever
R. Conorii : boutouneuse fever
Coxiella genus culture, resistance and pathogenicity
Culture: embryonated egg
Resistance: very good (dust 50 d)
Pathogenicity: no vectors needed
Q-fever (human, cattle, sheep, goat)
Clinical signs of Q fever
Human: pneumonia + fever
Cattle: abortion
Ehrlichia + neorickettsia genus morphology and culture
Morphology: coccoid
Culture: tissue, CANNOT be cultured in embryonated egg
Ehrlichia + neorickettsia genus pathogenicity + species
E. Canis; canine monocytic ehrlichiosis (fever)
E. Ruminatium; heartwaterof ruminants (liquid accumulation in thorax + pericardium)
N. Risticii; potomac horse fever (North America, Europe)
Ehrlichia commonly found in ?
Cytoplasm of neutrophils (WBC)
Anaplasma genus habitat and culture
Habitat: ticks, ru
Culture: in vitro not possible, only in living ruminants
Anaplasma genus species and pathogenicity
A. Marginale; cattle anaplasmosis (anaemiaj
A. Ovis : sheep + goat anaplasmosis (anaemia)
A. Phagocytophilum: tickborn fever of ru, equine granulocytic ehrlichiosis (oedema, lymphadenopathy)
