• Henning Bundgaard, DMSc,
• Johan Skov Bundgaard, BSc,
• Daniel Emil Tadeusz Raaschou-Pedersen, BSc,
• Christian von Buchwald, DMSc,
• Tobias Todsen, MD,
• Jakob Boesgaard Norsk, MD,
• Mia M. Pries-Heje, MD,
• Christoffer Rasmus Vissing, MD,
• Pernille B. Nielsen, MD,
• Ulrik C. Winsløw, MD,
• Kamille Fogh, MD,
• Rasmus Hasselbalch, MD,
• Jonas H. Kristensen, MD,
• Anna Ringgaard, PhD,
• Mikkel Porsborg Andersen, PhD,
• Nicole Bakkegård Goecke, PhD,
• Ramona Trebbien, PhD,
• Kerstin Skovgaard, PhD,
• Thomas Benfield, DMSc,
• Henrik Ullum, PhD,
• Christian Torp-Pedersen, DMSc,
• Kasper Iversen, DMSc

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According to the study, 1.8% of participants with masks got coronavirus. That compares to 2.1% of participants without masks.

A recommendation to wear a surgical mask when outside the home among others did not reduce, at conventional levels of statistical significance, incident SARS-CoV-2 infection compared with no mask recommendation.

ACPJOURNALS Study

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Read paper here.

Conclusion:

The recommendation to wear surgical masks to supplement other public health measures did not reduce the SARS-CoV-2 infection rate among wearers by more than 50% in a community with modest infection rates, some degree of social distancing, and uncommon general mask use. The data were compatible with lesser degrees of self-protection.