Tick-Borne Emerging Infections: Ehrlichiosis and Anaplasmosis

Nahed Ismail, Jere W. McBride

Research output: Contribution to journalReview articlepeer-review

139 Scopus citations


Human ehrlichiosis and anaplasmosis are acute febrile tick-borne infectious diseases caused by various members from the genera Ehrlichia and Anaplasma. Ehrlichia chaffeensis is the major etiologic agent of human monocytotropic ehrlichiosis (HME), while Anaplasma phagocytophilum is the major cause of human granulocytic anaplasmosis (HGA). The clinical manifestations of HME and HGA ranges from subclinical to potentially life-threatening diseases associated with multi-organ failure. Macrophages and neutrophils are the major target cells for Ehrlichia and Anaplasma, respectively. The threat to public health is increasing with newly emerging ehrlichial and anaplasma agents, yet vaccines for human ehrlichioses and anaplasmosis are not available, and therapeutic options are limited. This article reviews recent advances in the understanding of HME and HGA.

Original languageEnglish (US)
Pages (from-to)317-340
Number of pages24
JournalClinics in Laboratory Medicine
Issue number2
StatePublished - Jun 2017


  • Anaplasmosis
  • Diagnosis
  • Ehrlichiosis
  • Immunity
  • Pathogenesis

ASJC Scopus subject areas

  • Clinical Biochemistry
  • Biochemistry, medical


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