Perspective: The evidence on 4th doses of covid vaccines & the thorny question of age thresholds.

The Evidence On 4th Doses of Covid Vaccines & the Thorny Question of Age Thresholds – Absolutely Maybe Blog, by Hilda Bastian

Related:

U.S. approves second Covid-19 booster for people 50 and older and immunocompromised individuals.

[Preprint] Retrospective cohort study: second booster vaccine and Covid-19 mortality in adults 60 to 100 years old.

Among health care workers, a fourth dose vaccine effectiveness against any SARS-CoV-2 Omicron variant infection was 30% for the Pfizer–BioNTech and 11% for the Moderna.

[Preprint] Fourth dose of COVID vaccine offers only slight boost against Omicron infection.

Covid-19: Fourth vaccine doses—who needs them and why?

[Not published yet] Study in Israel finds fourth COVID booster has limited efficacy.

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