He would likely base that comment on the fact that no pre-2020 RCT studies of masks (over decades) showed any significant protective effect against aerosol-spread respiratory viruses.
Covid epidemic curves globally similarly showed no change as a result of mask mandates.
And a massive outbreak of influenza was not deterred by a fully masked U. Mich campus.
They seem to provide a psychological benefit to some though.
Covid epidemic curves globally similarly showed no change as a result of mask mandates.
And a massive outbreak of influenza was not deterred by a fully masked U. Mich campus.
They seem to provide a psychological benefit to some though.