Human granulocytic anaplasmosis (formerly human granulocytic ehrlichiosis)

Rickettsial Diseases

Animals Involved

Wild rodents, deer may be reservoirs in North America; livestock, wild ungulates, wild rodents may be reservoirs in Europe; many other animals (eg, equids, ruminants, dogs, cats, birds) can also be infected

Known Distributions

Worldwide

Probable Means of Spreading

Tick bites (Ixodes spp)

Clinical Manifestations in People

Resembles human monocytic ehrlichiosis; often asymptomatic to mild in immunocompetent; rash uncommon; estimated case fatality rate <1%

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