September 18, 20206 yr For those considering air travel, and long haul routes in particular, the following study answers many questions about potential for contagion, mask efficacy and related issues. From Harvard School of Public Health PDF can be accessed at the following link: https://cdn1.sph.harvard.edu/wp-content/uploads/sites/2443/2020/09/Face-Mask-Use-in-Air-Travel.pdf
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