Table 4.

More common tick-borne diseases

Tick-borne disease	Organism	Common vector (geographic area)
Rocky Mountain spotted fever	Rickettsia rickettsii	Dog tick, Dermacentor variabilis (central, Pacific coastal, and eastern US)
		Rocky Mountain wood tick, Dermacentor andersoni (western US)
Human monocytotropic ehrlichiosis	Ehrlichia chaffeensis	Lone Star tick (south central US in Maryland, Arkansas, Tennessee, Oklahoma, and Missouri) [60]
Human granulocytotropic anaplasmosis	Anaplasma phagocytophilum	Blacklegged tick, Ixodes scapularis (north central US and New England)
		Ixodes pacificus (California) [75]
Lyme disease	Borrelia burgdorferi	Ixodes scapularis (eastern US in New England and mid-Atlantic states and Midwest US in Wisconsin and Minnesota)
		Ixodes pacificus (west in northern California)
Babesiosis	Parasite, Babesia microti	Ixodes scapularis (northeast of the US)

Abbreviation: US, United States.