Abstract
Summary
Crude herpes virus suspensions were fractionated by the cesium chloride density gradient sedimentation method into enveloped and naked virus particles. Particles without envelopes were found to be almost non-infectious, whereas fractions containing enveloped particles were highly infectious. It appears, therefore, that the envelope plays an essential role in herpes virus infection.
The writer is pleased to acknowledge the technical assistance of Mr. Melvin Trousdale.
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