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.
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