Toniassoa SCC, Fernandesa FS, Jovelevithsb D, Filhoc FFD, et al. Reduction in COVID-19 prevalence in health care workers in a university hospital
in southern Brazil after the start of vaccination. Int J Infect Dis 2021 Jul 13. pii: S1201-9712(21)00582.
PMID: 34271203