A retrospective necropsy study of the ostrich (Struthio camelus) bursa of Fabricius

A retrospective study of bursa of Fabricius from 90 necropsied ostriches fr om Florida farms was performed. Eighty-five bursas showed lymphoid necrosis and/or depletion, and acute to chronic inflammation. Rounded cytoplasmic i nclusions were noted within bursal macrophages of 17 birds. Ultrastructural ly, these inclusions comprised arrays of icosahedral virions with a diamete r of 60 to 65 nm, suggesting possibly reovirus or birnavirus, Further work is needed to classify and determine the pathogenic significance of this vir us in the ostrich.