I can not find studies about Omicron right now, but Nature reports that vaccination provably reduces the spread of Delta variant, but requires boosters in the 3

I can not find studies about Omicron right now, but Nature reports that vaccination provably reduces the spread of Delta variant, but requires boosters in the 3 month range to maintain effectiveness: https://www.nature.com/articles/d41586-021-02689-y https://www.nature.com/articles/d41586-021-02689-y