Abstract
Summary
By following the method of Mudd it was found that the virus of Avian molluscum was not obtained in filtrates through Berkfeld V, Nand W types, Mandler, Seitz and neutral plaster filters. In one instance it was obtained in Chamberland LI (bis) filtrates. Adult hens were used in each case as test animals. After tryptic digestion the virus was not found in a filtrate from a Berk-feld V filter. This was also true with collodion membranes which would retain a precipitinogen.
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