Cancer was practically unknown until cowpox vaccination began to be introduced (in 1853). I have had to deal with 200 cases of cancer and I never saw a case of cancer in an unvaccinated person.
W B Clark 1909 
Cancer was practically unknown until cowpox vaccination began to be introduced (in 1853). I have had to deal with 200 cases of cancer and I never saw a case of cancer in an unvaccinated person.
W B Clark 1909
