Skowronski DM, Setayeshgar S, Zou M, Prystajecky N, et al. Single-dose mRNA vaccine effectiveness against SARS-CoV-2, including Alpha and Gamma variants: a test-negative design in adults 70 years and older in British Columbia, Canada. Clin Infect Dis 2021 Jul 9. pii: 6318435. doi: 10.1093.
PMID: 34244723