Alaska

Lyme disease is a bacterial infection (Borrelia burgdorferi) spread by black-legged ticks and the most common tick-borne illness in the US.

Tularemia is a highly infectious bacterial disease (Francisella tularensis) transmitted by tick bites, deer fly bites, and contact with infected animals.

Anaplasmosis is a bacterial infection (Anaplasma phagocytophilum) spread by black-legged ticks across the Northeast, Upper Midwest, and Pacific Coast.

Babesiosis is a malaria-like parasitic infection of red blood cells (Babesia microti) carried by black-legged ticks in the Northeast and Upper Midwest.

Ehrlichia chaffeensis ehrlichiosis is a bacterial infection of white blood cells spread by lone star ticks across the Southeast and south-central US.

Ehrlichia ewingii ehrlichiosis is a bacterial infection spread by lone star ticks, typically affecting immunocompromised patients in the southeastern US.

Spotted fever rickettsiosis is a group of bacterial infections — Rocky Mountain spotted fever among them — spread by dog and wood ticks across the US.

Undetermined ehrlichiosis/anaplasmosis is the CDC reporting category for cases where the specific Ehrlichia or Anaplasma species could not be identified.