Abstract
Summary
A method has been devised for counting virus particles in a suspension by means of the electron microscope. Studies on formolized purified swine influenza virus showed that the particles could be sedimented with a uniform distribution on a collodion membrane in the ultracentrifuge as revealed by electron micrographs of the particles on the membrane. The findings showed a close correlation with the dilution factor and with the number of particles calculated from chemical and physical data obtained with the virus.
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