SUMMARY: Twenty-three preparations of vaccinia virus and 5 of cowpox virus were examined by electron microscopy of spray droplets and by infectivity titrations at various stages of purification. Extraction of virus-containing tissues with a fluorocarbon compound was a useful early step in purification, but preparations of the highest purity were obtained by flocculation of the virus with -NaCl. The average ratio of total particle count to infectivity for the vaccinia virus preparations was 12. The lowest observed ratio based on reliable particle counts was 3·4.


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