What You Need to Know About Variants
Viruses constantly change through a process called mutation. As a virus mutates, new variants emerge.Transcript: https://www.cdc.gov/coronavirus/2019-ncov/videos/variants/COVID-19-Video_Audio_Transcript_what-you-need-to-know-about-variants.pdf
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http://www.cdc.gov/coronavirus/2019-ncov/videos/variants/324330_variant_anim_1.wmv
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