'...Most studies were
underpowered because of limited sample size, and some studies also reported
suboptimal adherence in the face mask group.'
在講Surface and Object Cleaning的部份:
'Although we
found no evidence that surface and object cleaning could reduce influenza transmission, this measure does have an established impact on prevention of other infectious diseases.'
'Respiratory etiquette is often listed as a preventive measure for respiratory infections. However,
there is a lack of scientific evidence to support this measure. Whether respiratory etiquette is an effective nonpharmaceutical intervention in preventing influenza virus transmission remains questionable, and worthy of further research.'

還有,講influenza的study,推廣到武漢肺炎 - 一個連mode of transmission,pathogenesis 都不知道的病, 這是 overgeneralisation。
這樣質素的paper都有膽出,CDC又肯出,事情真的很神奇。