The evidence to support medical exemptions for mask wearing is limited.
The predominant discourse revolves around a risk-based approach that considers the potential benefits and harms for individuals; few absolute exceptions to masking have been advocated.
Masks are one part of a comprehensive strategy to reduce the spread of SARS CoV-2 infection and should be viewed in the context of other public health measures including physical distancing, hand hygiene and respiratory etiquette.
Williams-Roberts, H; McLean, M; Groot, G; Young, C; Mueller, M; Miller, L. What evidence is there to support medical exemptions for mask wearing? 2020 Sep 17; Document no.: EOC091101 RR. In: COVID-19 Rapid Evidence Reviews [Internet]. SK: SK COVID Evidence Support Team, c2020. 20 p. (CEST rapid review report)