Abstract
Summary
The virus of equine encephalomyelitis, both the Eastern and the Western strains, was found to pass collodion membranes with an average pore diameter of 66 mμ, but was completely held back by those of 60 mμ. The results indicate that this virus has the same filtration end-point, and consequently the same particle size, as that of St. Louis encephalitis, which was shown by Bauer, Fite, and Webster, 8 and Elford and Perdrau 9 to be 20 to 30mμ.
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