Abstract
Infection of hamsters with equine abortion virus results in a fulminating disease that terminates fatally in 18–21 hours. In the latter half of this infection, the plasma and extracts of liver tissue contain particles in large numbers that the authors believe are the virus elementary bodies. By electron microscopy, the particles are round with average diameter 170 mμ; many have a tail of about 50-mμ width and variable length up to 340 mμ. They first appear about 9 hours after infection and increase rapidly in number to 10 11 per gram in the terminal stages. The particles appear and increase in parallel with the infectious titer of the tissues involved. Their number is consistent with the frequency of their appearance in electron micrographs of thin tissue sections.
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