Masking works.

“Meta-analysis of observational studies provided evidence of a protective effect of masks (OR = 0.13; 95% CI: 0.03-0.62) and respirators (OR = 0.12; 95% CI: 0.06-0.26) against severe acute respiratory syndrome (SARS). “

Vittoria Offeddu et al. Clin Infect Dis. 2017

Please share. 

https://www.change.org/p/justin-trudeau-mandatory-universal-masking-to-help-stop-the-spread-of-covid-19