Mask or No Mask? Why the Guidance Has Been Shifting
Employees wearing protective masks groom dogs at Scrubbers Self-Serve Dog Wash & Professional Grooming in West Bloomfield Township, Michigan, U.S., on June 5, 2020. (Photographer: Emily Elconin/Bloomberg)

Mask or No Mask? Why the Guidance Has Been Shifting

(Bloomberg) -- As the Covid-19 pandemic has unfolded, authorities in different places have said different things about whether healthy people should wear face masks to reduce the spread of the dise...
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