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. 1961 Nov 1;11(2):457–467. doi: 10.1083/jcb.11.2.457

ELECTRON MICROSCOPIC STUDY OF THE CYTOPATHOLOGY OF ECHO VIRUS INFECTION IN CULTIVATED CELLS

O Núñez-Montiel 1, J Weibel 1, J Vitelli-Flores 1
PMCID: PMC2225148  PMID: 14480725

Abstract

The cultivated monkey kidney cell is subject to changes when infected with ECHO viruses 6, 9, and 19. The electron microscope reveals three stages of infection: (a) initial stage. The nucleus appears granular with chromatin condensation on the nuclear envelope. The cytoplasm contains electron transparent vesicles and vacuoles forming nests. (b) Intermediate stage. The nucleus seems to diminish, appearing more pycnotic and displaced toward the periphery. The cytoplasm is filled with electron transparent vacuoles and vesicles, and dense masses as well as some spiral bodies are seen. The mitochondria retain their shape. Dense particles are seen, which are possibly of viral nature. (c) Final stage. The nucleus is contracted to a narrow strip close to the cellular membrane or is completely destroyed. The cytoplasm shows no apparent changes. Crystals are frequently observed in cells infected with ECHO viruses 6 and 19, consisting of dense particles with an average diameter of 14.4 mµ ranging from approximately 13.2 to 15.6 mµ for ECHO virus 6, and 14.5 mµ ranging from approximately 12.5 to 16.5 mµ for ECHO virus 19. These particles are clustered in hexagonal packages forming angles of 75° and 105°. The particles in most crystals are arranged in rows separated by a constant distance, the latter varying from one crystal to another and being approximately 1.5 and 2.5 times the distance between particles. Other particles were observed which, however, are not considered to be of viral nature.

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Selected References

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