autoinoculation

noun
au·​to·​in·​oc·​u·​la·​tion | \ -in-ˌäk-yə-ˈlā-shən How to pronounce autoinoculation (audio) \

Medical Definition of autoinoculation

1 : inoculation with vaccine prepared from material from one's own body
2 : spread of infection from one part to other parts of the same body