An electron microscope study of polyoma virus in hamster kidney
Abstract
Electron microscope studies were made of hamster kidneys taken at daily intervals after injection of a variant of polyoma virus into newborn animals. Particular attention was paid to the period 5 to 6 days after injection at which time the necrotizing response was at its peak and virus particles were seen in greatest numbers. The most numerous particles were about 28 mmicro in diameter. They were observed mainly within nuclei of stromal cells and are similar to the particles seen in large numbers in polyoma-infected mouse cells growing in vitro. They were not observed in cells of fully developed tumors. Filamentous or tubular structures closely associated with the 28 mmicro particles and probably concerned in their formation are described. Considerable quantities of viral material were contained within cytoplasmic inclusions. In some of the inclusions larger particles of diameter 60 mmicro were observed. The origin of these particles and their relation to the 28 mmicro particles is discussed.
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