This Zenodo record is a permanently preserved version of a PREreview. You can view the complete PREreview at https://prereview.org/reviews/7800482. The main findings of this paper regarding the association between vaccine effectiveness and hospitalization of people aged 65 years or older in terms of monovalent vaccine protection. Their case-control study found absolute vaccine effectiveness through 3 doses of monovalent vaccines for people of this age group for 6 months at a time. The paper was clear and adequate, suggesting further evidence of the effectiveness of boosters in preventing hospitalization. Competing interests The author declares that they have no competing interests.