Skip directly to site content Skip directly to page options Skip directly to A-Z link Skip directly to A-Z link Skip directly to A-Z link
Volume 2, Number 1—January 1996

Emergence of the Ehrlichioses as Human Health Problems

David H. Walker* and J. Stephen Dumler†
Author affiliations: *Department of Pathology, University of Texas Medical Branch at Galveston; †Department of Pathology, The Johns Hopkins Medical Institutions

Main Article

Table 2

Three related clusters of bacteria containing species designated as Ehrlichia

Vertebrate host Transmission Major target cell
Genogroup I
Ehrlichia canis Canids Rhipicephalus sanguineus tick bite Monocyte/macrophage
E. chaffeensis Humans, deer Amblyomma americanum tick bite Monocyte/macrophage
E. ewingii Canids A. americanum tick bite Polymorphonuclear leukocytes
E. muris Cowdria ruminantium Vole
Cattle, sheep, goats, antelope, African buffalo Unknown Amblyomma spp. tick bite Monocyte/macrophage Endothelium
Genogroup II
E. equi Horses Ixodes spp.tick bite Neutrophils
E. phagocytophila Sheep, cattle, deer Ixodes ricinus tick bite Neutrophils
Human granulocytic ehrlichia Humans, deer, rodents (?) I. scapularis (dammini) tick bite Neutrophils
E. platys Canids Unknown Platelets
Anaplasma marginale Cattle Boophilus, Rhipicephalus, and other tick bites Erythrocytes
Genogroup III
E. sennetsu Humans Possibly ingestion of raw fish Monocyte/macrophage
E. risticii Horses Unknown Monocytes, enterocytes, mast cells
Neorickettsia helminthoeca Canids Salmon fluke ingestion Macrophage
N. elokominica Canids Salmon fluke ingestion Macrophage
Stellantchasmus falcatus (SF) agent None known Grey mullet fluke Unknown

Main Article

Page created: December 20, 2010
Page updated: December 20, 2010
Page reviewed: December 20, 2010
The conclusions, findings, and opinions expressed by authors contributing to this journal do not necessarily reflect the official position of the U.S. Department of Health and Human Services, the Public Health Service, the Centers for Disease Control and Prevention, or the authors' affiliated institutions. Use of trade names is for identification only and does not imply endorsement by any of the groups named above.