The claim
新型コロナワクチン「KOSTAIVE」はフィンランド語で「復讐」？
Original review summary
The review finds that the claim is false: it says Finnish has no word “kostaive” and that the vaccine name derives from “Stave off COVID,” meaning to suppress COVID. The Finnish words for “revenge” and “to take revenge” are “kosto” and “kostaa,” respectively.[S1]
Research date:
Sources and attribution
- [S1] 日本ファクトチェックセンター original review
Original review · Retrieved October 16, 2026