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Human ehrlichioses: newly recognized infections transmitted by ticks

J S Dumler1, J S Bakken

  • 1Department of Pathology, Johns Hopkins University School of Medicine, Baltimore, Maryland 21287, USA.

Annual Review of Medicine
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Human ehrlichioses are tick-borne bacterial infections. Prompt doxycycline treatment is crucial for managing Ehrlichia infections, preventing severe complications, and ensuring patient recovery.

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Area of Science:

  • Infectious Diseases
  • Microbiology
  • Tick-Borne Illnesses

Background:

  • Human ehrlichioses are tick-borne infections caused by Ehrlichia bacteria.
  • Two main types are human monocytic ehrlichiosis (Ehrlichia chaffeensis) and human granulocytic ehrlichiosis (Ehrlichia equi-like agent).
  • These infections present with non-specific symptoms like fever, headache, and low blood counts, complicating diagnosis.

Purpose of the Study:

  • To differentiate between human monocytic and granulocytic ehrlichiosis.
  • To highlight distinct diagnostic methods for each type.
  • To emphasize the importance of timely empirical treatment for Ehrlichia infections.

Main Methods:

  • Clinical presentation analysis of human ehrlichioses.
  • Identification of causative agents and tick vectors.
  • Review of diagnostic approaches and treatment outcomes.

Main Results:

  • Ehrlichia chaffeensis infects mononuclear phagocytes, transmitted by Lone Star ticks in the US.
  • The granulocytic ehrlichiosis agent infects neutrophils, transmitted by Ixodes ticks in the upper Midwest/Northeast US.
  • Delayed diagnosis and therapy increase the risk of severe complications, including meningoencephalitis and shock.

Conclusions:

  • Despite similar initial symptoms, distinct diagnostic methods are required for human ehrlichioses.
  • Empirical treatment with doxycycline is recommended due to the risk of severe outcomes with delayed diagnosis.
  • Doxycycline therapy typically leads to rapid improvement and cure of Ehrlichia infections.