Chapter 18

Infectious Injury to Bone Marrow

First published: 04 March 2022

Summary

The response of the bone marrow to infectious agents is variable, depending on the organism involved, the nature and chronicity of infection, and the presence of other diseases. The marrow response to common companion or domestic animal infectious diseases known for their marrow involvement is described in this chapter. Bacteria within the families Rickettsiaceae and Anaplasmataceae of the order Rickettsiales cause a variety of diseases in dogs, cats, horses, and cattle; however, marrow changes are best documented for infections caused by Ehrlichia canis . Leishmaniasis is a disease caused by protozoal organisms of the genus Leishmania , and is transmitted in Mediterranean regions by the bite of an infected female sand fly. Blastomycosis, histoplasmosis, coccidioidomycosis, and cryptococcosis are common systemic fungal diseases of the dog and cat. Although all of these diseases can involve the bone marrow, marrow involvement is most frequently described in histoplasmosis.

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