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FILE - Pfizer COVID-19 vaccines sit ready for use at a Dallas County Health and Human Services drive up vaccine site in Mesquite, Texas, Nov. 30, 2021. While all eyes are on the new and little-understood omicron variant, the delta form of the coronavirus isn't finished wreaking havoc in the U.S. There is much that is unknown about omicron, including whether it is more contagious than previous versions, makes people sicker or more easily thwarts the vaccine or breaks through the immunity that people get from a bout of COVID-19. (AP Photo/LM Otero, File)

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FILE - A traveler adjusts his face mask as he walks through the arrivals area at the Los Angeles International Airport in Los Angeles, Nov. 30, 2021. While all eyes are on the new and little-understood omicron variant, the delta form of the coronavirus isn't finished wreaking havoc in the U.S. (AP Photo/Jae C. Hong, File)

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FILE - Visitors walk around a memorial for victims of COVID-19 at the Griffith Observatory, Nov. 19, 2021, in Los Angeles. While all eyes are on the new and little-understood omicron variant, the delta form of the coronavirus isn't finished wreaking havoc in the U.S. (AP Photo/Marcio Jose Sanchez, File)

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FILE - An information sign is displayed as a child arrives with her parent to receive the Pfizer COVID-19 vaccine for children 5 to 11-years-old at London Middle School in Wheeling, Ill., Nov. 17, 2021. While all eyes are on the new and little-understood omicron variant, the delta form of the coronavirus isn't finished wreaking havoc in the U.S. There is much that is unknown about omicron, including whether it is more contagious than previous versions, makes people sicker or more easily thwarts the vaccine or breaks through the immunity that people get from a bout of COVID-19. (AP Photo/Nam Y. Huh, File)

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FILE - Licensed practical nurse Yokasta Castro, of Warwick, R.I., draws a Moderna COVID-19 vaccine into a syringe at a mass vaccination clinic, May 19, 2021, at Gillette Stadium, in Foxborough, Mass. While all eyes are on the new and little-understood omicron variant, the delta form of the coronavirus isn't finished wreaking havoc in the U.S. There is much that is unknown about omicron, including whether it is more contagious than previous versions, makes people sicker or more easily thwarts the vaccine or breaks through the immunity that people get from a bout of COVID-19. (AP Photo/Steven Senne, File)