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Two Autochthonous Cases of Anaplasmosis, Washington, USA, 2022-2023
Emerging Infectious Diseases
|December 11, 2025
Summary
Two cases of human anaplasmosis, a rare tick-borne illness, were identified in Washington, USA. Clinicians should consider anaplasmosis in patients with symptoms after potential tick exposure.
Area of Science:
- Infectious Diseases
- Epidemiology
- Medical Entomology
Background:
- Human anaplasmosis is a tick-borne illness caused by Anaplasma phagocytophilum.
- The disease is endemic in various regions, but rarely reported in Washington, USA.
- Ixodes pacificus is the primary vector in the Pacific Northwest.

