CDC STACKS serves as an archival repository of CDC-published products including scientific findings, journal articles, guidelines, recommendations, or other public health information authored or co-authored by CDC or funded partners.
As a repository, CDC STACKS retains documents in their original published format to ensure public access to scientific information.
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Description:COVID-19: Masks are required on planes, buses, trains, and other forms of public transportation in the United States. This includes when you are traveling into and out of the U.S.
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[PDF-2.96 MB]