Abstract
Known icterogenic (SH) serum (J. W. strain), undiluted and diluted 10% in normal saline, was filtered through gradocol membranes of various avg. pore diameters down to 52 m/i, and tested in human volunteers. Evidence has been presented that the strain of serum hepatitis virus used is small enough to pass through a 52 m/x A.P.D. membrane, thus indicating a size of 26 m/x or less. The limitations of the appln. of this method for determining the size of this virus are mentioned.

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