Medical/surgical masks compared to no masks
Wearing masks in the community probably makes little or no difference to the outcome of influenza‐like illness
wearing a mask may make little to no difference in how many people caught a flu-like illness/COVID-like illness
Risk ratio (RR) 0.95, (0.84 to 1.09)
9 trials, n = 276,917 participants
Moderate-certainty evidence.
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