Mateo-Urdiales A, Sacco C, Fotakis EA, Del Manso M, et al. Relative effectiveness of monovalent and bivalent mRNA boosters in preventing severe COVID-19 due to omicron BA.5 infection up to 4 months post-administration in people aged 60 years or older in Italy: a retrospective matched cohort study. Lancet Infect Dis 2023 Jul 18:S1473-3099(23)00374.
PMID: 37478877