Abstract
Summary
Studies by electron microscope of brains and spinal cords of mice infected with West Nile virus, B 956 strain, show the virus to be cube-shaped with a diameter of 38-40 m/x. These bodies could not be demonstrated in concentrated normal mice brains and spinal cords subjected to the same procedure of concentration and examination. The bodies from the West Nile preparations resemble the rabbit papilloma virus described by Sharp et al. 3 The virus in the concentrated material was infectious for unvaccinated mice but had no effect on mice previously immunized against the West Nile virus.
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