Can face masks offer protection against SARS?
According to research on the SARS epidemic, face masks were the most consistently effective intervention for reducing the contraction and spread of SARS. In a
Cochrane Review on the subject, six out of seven studies showed that face masks (surgical and N95) offered significant protection against SARS. Hand washing was also very effective, supported by four out of seven studies in a multivariate analysis.
Although most of the studies in the Cochrane Review were on medical workers in a hospital setting,
one study followed community transmission of SARS in Beijing. It found that consistently wearing a mask in public was associated with a 70% reduction in the risk of catching SARS. Additionally, the authors of the paper noted that most people in the community wore simple surgical masks, not N95 respirators.