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What s the Science Behind CDC s Outdoor Mask Guidance?

email article When the CDC loosened mask guidance for outdoor activities this week, it did so based on high vaccine effectiveness and on evidence that transmission of SARS-CoV-2 is far less frequent in the open air. Vaccinated people can now safely gather, mask-less, with friends and family outside, and even unvaccinated individuals can take off their mask while walking, running, or biking with their household, or at small gatherings of fully vaccinated people. But CDC still warned that vaccinated people should keep their masks on in crowded outdoor settings, such as a parade or concert, and experts caution there are other scenarios where masking outdoors may still be a good idea because outdoor transmission isn t impossible.

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