Ehrlichiosis

Ehrlichiosis is the general name used to describe several bacterial diseases that affect animals and humans.  Human ehrlichiosis is a disease caused by at least three different ehrlichial species in the United States: Ehrlichia chaffeensisEhrlichia ewingii, and a third Ehrlichia species provisionally called Ehrlichia muris-like (EML). Ehrlichiae are transmitted to humans by the bite of an infected tick. The lone star tick (Amblyomma americanum) is the primary vector of both Ehrlichia chaffeensis and Ehrlichia ewingii in the United States. Typical symptoms include: fever, headache, fatigue, and muscle aches. Usually, these symptoms occur within 1-2 weeks following a tick bite. Ehrlichiosis is diagnosed based on symptoms, clinical presentation, and later confirmed with specialized laboratory tests. The first line treatment for adults and children of all ages is doxycycline.  Ehrlichiosis and other tickborne diseases can be prevented.  (Credit: CDC)


Please visit the Centers for Disease Control and Prevention (CDC) page for details on:

  • Symptoms
  • Diagnosis
  • Treatment
  • Statistics and epidemiology
  • Guidance for health practitioners