Abstract
Summary
Mouse brains infected with the FA strain of Theiler's mouse encephalomyelitis virus have been diluted ten million times so that the solutions were no longer infective. By means of pervaporation it has been possible to concentrate 4000 cc samples of such inactive solutions into volumes of 40 to 80 cc. The virus present in the pervaporated solutions has been further concentrated by sedimentation in the ultracentrifuge into active fractions less than 1 cc in volume.
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