The view that vaccinia is attenuated variola is well known, and has been extensively adopted by English physicians.
"Scientific American Supplement, No. 421, January 26, 1884" by Various
By vaccinating a person we inoculate him with vaccinia or cowpox.
"Essays In Pastoral Medicine" by Austin ÓMalley
What has been termed generalized vaccinia is another form of irregularity.
"A System of Practical Medicine by American Authors, Vol. I" by Various