the Latin vacca, a cow) which is communicable to human beings
Now there is a disease of cows know as cowpox or vaccinia (from
the Latin vacca, a cow) which is communicable to human beings.
It is thought to be due to the same virus which in pigs is
called swinepox and in horses 'grease.' Jenner believed
vaccinia to be the same pathological entity as human smallpox,
modified, however, by its transmission through the cow. For a
long time this view was stoutly resisted, but it has now been
accepted as probably representing the truth. The identity of
vaccinia and 'grease' is certainly much more doubtful.
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