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Volume 4, Number 2—June 1998


Rickettsial Pathogens and Their Arthropod Vectors

Abdu F. Azad*Comments to Author  and Charles B. Beard†
Author affiliations: *University of Maryland School of Medicine, Baltimore, Maryland, USA; †Centers for Disease Control and Prevention, Atlanta, Georgia, USA

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Table 2

Epidemiologic characteristics of the North American tick-borne rickettsiaa

Rickettsia species Natural cycle
Disease Vectors Hosts
Rickettsia rickettsii Rocky Mountain spotted fever Dermacentor, Amblyomma, Rhipicephalus, Haemaphysalis, Small mammals, dogs, rabbits, birds
R. akari Rickettsialpox Liponyssoides House mice, rats
R. amblyommii R. amblyommii A. americanum Small mammals Small mammals
R. bellii D. andersoni, D. variabilis, D. occidentalis, D. albopictus H. leporispalustris, Rodents, dogs
R. canada Haemaphysalis Rabbits, hares, birds
R. montana D. andersoni, D. variabilis Rodents, dogs
R. parkeri A. americanum, A. maculatum Domestic animals, birds, rodents,
R. peacockii D. andersoni Rodents, deer
R. rhipicephali R. sanguineus, D. andersoni, D. variabilis, D. occidentalis Small mammals

aExcluding four as yet undescribed species of SFG rickettsiae (WB-8-2, 364-D, Tillamook, and the D. parumapertus agent).

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