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Ehrlichia chaffeensis is a bacterium that causes ehrlichiosis, a tick-borne illness affecting humans and animals, particularly dogs. This infection primarily targets white blood cells and can range from mild to life-threatening if not treated promptly.1

Ehrlichiosis is transmitted through the bite of an infected tick, with the lone star tick (Amblyomma americanum) and the blacklegged tick (Ixodes scapularis) being the main vectors. Symptoms in humans often mimic the flu, including fever, chills, headache, muscle aches, and fatigue. In more severe cases, confusion, respiratory problems, bleeding issues, or a rash can occur. Prompt treatment with antibiotics, typically doxycycline, is crucial for recovery.21

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