The rollout would begin the week of Sept. 20 for U.S. residents 18 and older who received their second shot of the Moderna or Pfizer-BioNTech vaccines at least eight months previously.
Two studies on children used N95 masks, which are more sophisticated than the masks most schoolchildren will use, but even these found no significant effect on breathing.
Aug 18, 2021
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A health care worker unpacks the Pfizer vaccine at Oregon Health & Science University.
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OHSU