antianaphylaxis

noun

an·​ti·​an·​a·​phy·​lax·​is -ˌan-ə-fə-ˈlak-səs 

plural antianaphylaxes -ˌsēz 

1

: a condition in which an anaphylactic reaction is not obtained because of the presence of free antibodies in the blood

2

: the state of desensitization to an antigen