Send to

Choose Destination
J Infect Dis. 1997 Jan;175(1):210-3.

Ultrastructural and antigenic characterization of a granulocytic ehrlichiosis agent directly isolated and stably cultivated from a patient in New York state.

Author information

Department of Veterinary Biosciences, College of Veterinary Medicine, Ohio State University, Columbus 43210-1093, USA.


A human granulocytic ehrlichiosis (HGE) agent with 16S rDNA sequence identical to the published sequence of HGE agents was isolated from a patient from New York State by inoculation of the blood leukocyte fraction directly into a human promyelocytic leukemia cell line HL-60. The HGE agent was also isolated from the leukocyte fraction of the blood and bone marrow of a mouse inoculated with the leukocyte fraction of the patient's blood. The isolate has been passaged in tissue culture 30 times over 8 months. Electron microscopy revealed pleomorphic coccobacilli with a thin and highly rippled outer membrane in the clear inclusion matrix. Comparison of IFA reactivity of antisera obtained from a variety of sources with the cell-cultured HGE agent revealed that 3 HGE agent strains (New York isolate, Wisconsin [BDS] isolate, and a tick-derived isolate) are highly cross-reactive and there are diverse antigenic cross-reactivities between HGE agent and Ehrlichia chaffeensis.

[Indexed for MEDLINE]

Supplemental Content

Full text links

Icon for Silverchair Information Systems
Loading ...
Support Center