Electron-microscopic study of the development of an equine adenovirus in cultured fetal equine kidney cells

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Abstract
Sequential changes induced by an equine adenovirus in cultured fetal equine kidney cells were studied by electron microscopy. The first morphological change was the appearance of type I inclusions. These inclusions developed to type II inclusions which appeared as ring forms. Type III inclusions were formed within the central part of type II inclusions and finally filled up most of the nuclear space. As the infection proceeded, type IV inclusions which appeared as dense dark-staining spheres were formed at the center of the type III inclusions and also inside the cytoplasm. These dark-staining spheres developed and their center was filled with light-staining material and virus particles which eventually resulted in the formation of type V inclusions. Autoradiography study showed that types I, II, and III were composed of nucleoprotein and type IV was composed of protein.

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