KNTV NBC Nightly News With Lester Holt February 7, 2022 23:38:00
They are is limited. one survey conducted by the cdc of 169 schools in georgia found those with the mask requirement had 21% fewer covid cases than schools where masks were optional. another study in arizona found schools were 3.5 times more likely to experience a covid outbreak if they did not have a mask requirement. but the methodology of those studies has been questioned. >> we dont have very convincing studies that masks have a large impact on preventing either transmission of disease withi...
Source: archive.org