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Human granulocytic ehrlichiosis (HGE) is an emerging tickborne infection resulting in an acute febrile illness associated with cytopenias and characteristic intracellular organisms within peripheral blood granulocytes. The etiologic agent of HGE has recently been isolated and cultivated in the HL-60 promyelocytic leukemia cell line, but the spectrum of host cells that it naturally infects remains unknown. To determine if normal hematopoietic progenitors could be targets of infection, CD34+ primary human bone marrow cells, stimulated to differentiate along myelomonocytic lineages, were incubated with the HGE agent. Immature marrow progenitors and, remarkably, not only granulocytic but also CD14+ monocytic cells from these cultures supported replication of the HGE agent, suggesting that all are potential targets of infection in vivo. Infection of bone marrow progenitors may contribute to the hematologic manifestations of HGE. Furthermore, the ability of the agent to interact with monocytes has significant implications regarding disease pathogenesis and host response.

the journal of infectious diseases (online. university of chicago press)/the journal of infectious diseases

Primary Bone Marrow Progenitors of Both Granulocytic and Monocytic Lineages Are Susceptible to Infection with the Agent of Human Granulocytic Ehrlichiosis