Webster's dictionary defines inoculation as "the act or process of improving." Also, I find that "inoculation may be protective, when the substance injected aims to secure immunity; or curative, when an anti-toxin is injected as a remedy."
Proceedings of the Iowa Academy of Science
©1937 Iowa Academy of Science, Inc.
Shawhan, Fae M.
"Inoculation Against Spring Fever in the Elementary Course in Zoology,"
Proceedings of the Iowa Academy of Science, 44(1), 209-211.
Available at: https://scholarworks.uni.edu/pias/vol44/iss1/97