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. 1950 Dec;31(6):789–796.
The Viruses of Variola, Vaccinia, Cowpox and Ectromelia.—Neutralization Tests on the Chorio-Allantois with Unabsorbed and Absorbed Immune Sera
A W Downie
, K McCarthy
A W Downie
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K McCarthy
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PMCID: PMC2073393 PMID: 14801363