The history of flu immunizations ​ — from the ill - fated swine flu episode of 1976 to the production shortage of 2004 — ​ has been spotty.
Gripivastase vaktsineerimise ajalugu alates õnnetust seagripi episoodist aastal 1976 kuni vaktsiininappuseni aastal 2004 pole olnud kaugeltki pilvitu.