'Molecular genetic analysis of vaccinia virus genes which confer
resistance to alpha-amanitin' -- subject(s): Genetics, Vaccinia
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Immunization against smallpox has, for centuries, been infection
with live vaccinia virus.
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No. Vaccinia is "large" ... for a virus, which still means
"tiny" compared to any ordinary human scale. The smallest things
visible to the naked eye are on the order of 10-4 m; vaccinia is
well under 10-6 m ... over a hundred times too small to see. It's
just barely larger than the smallest thing visible with an optical
microscope