Abstract
Summary
Treatment of H-l or HB viruses with a purified hemagglutination inhibitor derived from human placental fluids induces the formation of large three-dimensional aggregates of virus. Fibrils, 10áR or less in diameter, appear to connect the virus though they may not be the cause of the virus clumping. The placental inhibitor does not affect H-3 or RV viruses. When antibody is added to its homologous virus, aggregates are also formed. These are 2-dimensional and much smaller than those formed by the placental fluid fraction. They are characterized by the presence of fibrils, believed to be antibody, which join the individual virus particles.
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