Kim SS, Chung JR, Belongia EA, McLean HQ, et al. mRNA Vaccine Effectiveness against COVID-19 among Symptomatic Outpatients Aged >/=16 Years in the United States, February - May 2021. J Infect Dis 2021 Sep 8. pii: 6366365. doi: 10.1093.
PMID: 34498052