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As omicron looms, US is still battling the delta wave

A passer-by enters a pharmacy with a vaccination advisory attached to a door, right, Thursday, Dec. 2, 2021, in Worcester, Mass. As the U.S. recorded its first confirmed case of the omicron variant, doctors across the country are experiencing a more imminent crisis with a delta variant that is sending record numbers of people to the hospital in New England and the Midwest. (AP Photo/Steven Senne) A passer-by enters a pharmacy with a vaccination advisory attached to a door, right, Thursday, Dec. 2, 2021, in Worcester, Mass. As the U.S. recorded its first confirmed case of the omicron variant, doctors across the country are experiencing a more imminent crisis with a delta variant that is sending record numbers of people to the hospital in New England and the Midwest. (AP Photo/Steven Senne) A passer-by enters a pharmacy with a vaccination advisory attached to a door, right, Thursday, Dec. 2, 2021, in Worcester, Mass. As the U.S. recorded its first confirmed case of the omicron variant, doctors across the country are experiencing a more imminent crisis with a delta variant that is sending record numbers of people to the hospital in New England and the Midwest. (AP Photo/Steven Senne) A passer-by enters a pharmacy with a vaccination advisory attached to a door, right, Thursday, Dec. 2, 2021, in Worcester, Mass. As the U.S. recorded its first confirmed case of the omicron variant, doctors across the country are experiencing a more imminent crisis with a delta variant that is sending record numbers of people to the hospital in New England and the Midwest. (AP Photo/Steven Senne) A passer-by enters a pharmacy with a vaccination advisory attached to a door, right, Thursday, Dec. 2, 2021, in Worcester, Mass. As the U.S. recorded its first confirmed case of the omicron variant, doctors across the country are experiencing a more imminent crisis with a delta variant that is sending record numbers of people to the hospital in New England and the Midwest. (AP Photo/Steven Senne) A passer-by enters a pharmacy with a vaccination advisory attached to a door, right, Thursday, Dec. 2, 2021, in Worcester, Mass. As the U.S. recorded its first confirmed case of the omicron variant, doctors across the country are experiencing a more imminent crisis with a delta variant that is sending record numbers of people to the hospital in New England and the Midwest. (AP Photo/Steven Senne) A passer-by enters a pharmacy with a vaccination advisory attached to a door, right, Thursday, Dec. 2, 2021, in Worcester, Mass. As the U.S. recorded its first confirmed case of the omicron variant, doctors across the country are experiencing a more imminent crisis with a delta variant that is sending record numbers of people to the hospital in New England and the Midwest. (AP Photo/Steven Senne) A passer-by enters a pharmacy with a vaccination advisory attached to a door, right, Thursday, Dec. 2, 2021, in Worcester, Mass. As the U.S. recorded its first confirmed case of the omicron variant, doctors across the country are experiencing a more imminent crisis with a delta variant that is sending record numbers of people to the hospital in New England and the Midwest. (AP Photo/Steven Senne) A passer-by enters a pharmacy with a vaccination advisory attached to a door, right, Thursday, Dec. 2, 2021, in Worcester, Mass. As the U.S. recorded its first confirmed case of the omicron variant, doctors across the country are experiencing a more imminent crisis with a delta variant that is sending record numbers of people to the hospital in New England and the Midwest. (AP Photo/Steven Senne) A passer-by enters a pharmacy with a vaccination advisory attached to a door, right, Thursday, Dec. 2, 2021, in Worcester, Mass. As the U.S. recorded its first confirmed case of the omicron variant, doctors across the country are experiencing a more imminent crisis with a delta variant that is sending record numbers of people to the hospital in New England and the Midwest. (AP Photo/Steven Senne) A passer-by enters a pharmacy with a vaccination advisory attached to a door, right, Thursday, Dec. 2, 2021, in Worcester, Mass. As the U.S. recorded its first confirmed case of the omicron variant, doctors across the country are experiencing a more imminent crisis with a delta variant that is sending record numbers of people to the hospital in New England and the Midwest. (AP Photo/Steven Senne) A passer-by enters a pharmacy with a vaccination advisory attached to a door, right, Thursday, Dec. 2, 2021, in Worcester, Mass. As the U.S. recorded its first confirmed case of the omicron variant, doctors across the country are experiencing a more imminent crisis with a delta variant that is sending record numbers of people to the hospital in New England and the Midwest. (AP Photo/Steven Senne) A passer-by enters a pharmacy with a vaccination advisory attached to a door, right, Thursday, Dec. 2, 2021, in Worcester, Mass. As the U.S. recorded its first confirmed case of the omicron variant, doctors across the country are experiencing a more imminent crisis with a delta variant that is sending record numbers of people to the hospital in New England and the Midwest. (AP Photo/Steven Senne) A passer-by enters a pharmacy with a vaccination advisory attached to a door, right, Thursday, Dec. 2, 2021, in Worcester, Mass. As the U.S. recorded its first confirmed case of the omicron variant, doctors across the country are experiencing a more imminent crisis with a delta variant that is sending record numbers of people to the hospital in New England and the Midwest. (AP Photo/Steven Senne) A passer-by enters a pharmacy with a vaccination advisory attached to a door, right, Thursday, Dec. 2, 2021, in Worcester, Mass. As the U.S. recorded its first confirmed case of the omicron variant, doctors across the country are experiencing a more imminent crisis with a delta variant that is sending record numbers of people to the hospital in New England and the Midwest. (AP Photo/Steven Senne) A passer-by enters a pharmacy with a vaccination advisory attached to a door, right, Thursday, Dec. 2, 2021, in Worcester, Mass. As the U.S. recorded its first confirmed case of the omicron variant, doctors across the country are experiencing a more imminent crisis with a delta variant that is sending record numbers of people to the hospital in New England and the Midwest. (AP Photo/Steven Senne) A passer-by enters a pharmacy with a vaccination advisory attached to a door, right, Thursday, Dec. 2, 2021, in Worcester, Mass. As the U.S. recorded its first confirmed case of the omicron variant, doctors across the country are experiencing a more imminent crisis with a delta variant that is sending record numbers of people to the hospital in New England and the Midwest. (AP Photo/Steven Senne) A passer-by enters a pharmacy with a vaccination advisory attached to a door, right, Thursday, Dec. 2, 2021, in Worcester, Mass. As the U.S. recorded its first confirmed case of the omicron variant, doctors across the country are experiencing a more imminent crisis with a delta variant that is sending record numbers of people to the hospital in New England and the Midwest. (AP Photo/Steven Senne) A passer-by enters a pharmacy with a vaccination advisory attached to a door, right, Thursday, Dec. 2, 2021, in Worcester, Mass. As the U.S. recorded its first confirmed case of the omicron variant, doctors across the country are experiencing a more imminent crisis with a delta variant that is sending record numbers of people to the hospital in New England and the Midwest. (AP Photo/Steven Senne) A passer-by enters a pharmacy with a vaccination advisory attached to a door, right, Thursday, Dec. 2, 2021, in Worcester, Mass. As the U.S. recorded its first confirmed case of the omicron variant, doctors across the country are experiencing a more imminent crisis with a delta variant that is sending record numbers of people to the hospital in New England and the Midwest. (AP Photo/Steven Senne) A passer-by enters a pharmacy with a vaccination advisory attached to a door, right, Thursday, Dec. 2, 2021, in Worcester, Mass. As the U.S. recorded its first confirmed case of the omicron variant, doctors across the country are experiencing a more imminent crisis with a delta variant that is sending record numbers of people to the hospital in New England and the Midwest. (AP Photo/Steven Senne) A passer-by enters a pharmacy with a vaccination advisory attached to a door, right, Thursday, Dec. 2, 2021, in Worcester, Mass. As the U.S. recorded its first confirmed case of the omicron variant, doctors across the country are experiencing a more imminent crisis with a delta variant that is sending record numbers of people to the hospital in New England and the Midwest. (AP Photo/Steven Senne) A passer-by enters a pharmacy with a vaccination advisory attached to a door, right, Thursday, Dec. 2, 2021, in Worcester, Mass. As the U.S. recorded its first confirmed case of the omicron variant, doctors across the country are experiencing a more imminent crisis with a delta variant that is sending record numbers of people to the hospital in New England and the Midwest. (AP Photo/Steven Senne) A passer-by enters a pharmacy with a vaccination advisory attached to a door, right, Thursday, Dec. 2, 2021, in Worcester, Mass. As the U.S. recorded its first confirmed case of the omicron variant, doctors across the country are experiencing a more imminent crisis with a delta variant that is sending record numbers of people to the hospital in New England and the Midwest. (AP Photo/Steven Senne) A passer-by enters a pharmacy with a vaccination advisory attached to a door, right, Thursday, Dec. 2, 2021, in Worcester, Mass. As the U.S. recorded its first confirmed case of the omicron variant, doctors across the country are experiencing a more imminent crisis with a delta variant that is sending record numbers of people to the hospital in New England and the Midwest. (AP Photo/Steven Senne) A passer-by enters a pharmacy with a vaccination advisory attached to a door, right, Thursday, Dec. 2, 2021, in Worcester, Mass. As the U.S. recorded its first confirmed case of the omicron variant, doctors across the country are experiencing a more imminent crisis with a delta variant that is sending record numbers of people to the hospital in New England and the Midwest. (AP Photo/Steven Senne) A passer-by enters a pharmacy with a vaccination advisory attached to a door, right, Thursday, Dec. 2, 2021, in Worcester, Mass. As the U.S. recorded its first confirmed case of the omicron variant, doctors across the country are experiencing a more imminent crisis with a delta variant that is sending record numbers of people to the hospital in New England and the Midwest. (AP Photo/Steven Senne) A passer-by enters a pharmacy with a vaccination advisory attached to a door, right, Thursday, Dec. 2, 2021, in Worcester, Mass. As the U.S. recorded its first confirmed case of the omicron variant, doctors across the country are experiencing a more imminent crisis with a delta variant that is sending record numbers of people to the hospital in New England and the Midwest. (AP Photo/Steven Senne) A passer-by enters a pharmacy with a vaccination advisory attached to a door, right, Thursday, Dec. 2, 2021, in Worcester, Mass. As the U.S. recorded its first confirmed case of the omicron variant, doctors across the country are experiencing a more imminent crisis with a delta variant that is sending record numbers of people to the hospital in New England and the Midwest. (AP Photo/Steven Senne) A passer-by enters a pharmacy with a vaccination advisory attached to a door, right, Thursday, Dec. 2, 2021, in Worcester, Mass. As the U.S. recorded its first confirmed case of the omicron variant, doctors across the country are experiencing a more imminent crisis with a delta variant that is sending record numbers of people to the hospital in New England and the Midwest. (AP Photo/Steven Senne) A passer-by enters a pharmacy with a vaccination advisory attached to a door, right, Thursday, Dec. 2, 2021, in Worcester, Mass. As the U.S. recorded its first confirmed case of the omicron variant, doctors across the country are experiencing a more imminent crisis with a delta variant that is sending record numbers of people to the hospital in New England and the Midwest. (AP Photo/Steven Senne) A passer-by enters a pharmacy with a vaccination advisory attached to a door, right, Thursday, Dec. 2, 2021, in Worcester, Mass. As the U.S. recorded its first confirmed case of the omicron variant, doctors across the country are experiencing a more imminent crisis with a delta variant that is sending record numbers of people to the hospital in New England and the Midwest. (AP Photo/Steven Senne) A passer-by enters a pharmacy with a vaccination advisory attached to a door, right, Thursday, Dec. 2, 2021, in Worcester, Mass. As the U.S. recorded its first confirmed case of the omicron variant, doctors across the country are experiencing a more imminent crisis with a delta variant that is sending record numbers of people to the hospital in New England and the Midwest. (AP Photo/Steven Senne) A passer-by enters a pharmacy with a vaccination advisory attached to a door, right, Thursday, Dec. 2, 2021, in Worcester, Mass. As the U.S. recorded its first confirmed case of the omicron variant, doctors across the country are experiencing a more imminent crisis with a delta variant that is sending record numbers of people to the hospital in New England and the Midwest. (AP Photo/Steven Senne) A passer-by enters a pharmacy with a vaccination advisory attached to a door, right, Thursday, Dec. 2, 2021, in Worcester, Mass. As the U.S. recorded its first confirmed case of the omicron variant, doctors across the country are experiencing a more imminent crisis with a delta variant that is sending record numbers of people to the hospital in New England and the Midwest. (AP Photo/Steven Senne) A passer-by enters a pharmacy with a vaccination advisory attached to a door, right, Thursday, Dec. 2, 2021, in Worcester, Mass. As the U.S. recorded its first confirmed case of the omicron variant, doctors across the country are experiencing a more imminent crisis with a delta variant that is sending record numbers of people to the hospital in New England and the Midwest. (AP Photo/Steven Senne) A passer-by enters a pharmacy with a vaccination advisory attached to a door, right, Thursday, Dec. 2, 2021, in Worcester, Mass. As the U.S. recorded its first confirmed case of the omicron variant, doctors across the country are experiencing a more imminent crisis with a delta variant that is sending record numbers of people to the hospital in New England and the Midwest. (AP Photo/Steven Senne) A passer-by enters a pharmacy with a vaccination advisory attached to a door, right, Thursday, Dec. 2, 2021, in Worcester, Mass. As the U.S. recorded its first confirmed case of the omicron variant, doctors across the country are experiencing a more imminent crisis with a delta variant that is sending record numbers of people to the hospital in New England and the Midwest. (AP Photo/Steven Senne) A passer-by enters a pharmacy with a vaccination advisory attached to a door, right, Thursday, Dec. 2, 2021, in Worcester, Mass. As the U.S. recorded its first confirmed case of the omicron variant, doctors across the country are experiencing a more imminent crisis with a delta variant that is sending record numbers of people to the hospital in New England and the Midwest. (AP Photo/Steven Senne) A passer-by enters a pharmacy with a vaccination advisory attached to a door, right, Thursday, Dec. 2, 2021, in Worcester, Mass. As the U.S. recorded its first confirmed case of the omicron variant, doctors across the country are experiencing a more imminent crisis with a delta variant that is sending record numbers of people to the hospital in New England and the Midwest. (AP Photo/Steven Senne) A passer-by enters a pharmacy with a vaccination advisory attached to a door, right, Thursday, Dec. 2, 2021, in Worcester, Mass. As the U.S. recorded its first confirmed case of the omicron variant, doctors across the country are experiencing a more imminent crisis with a delta variant that is sending record numbers of people to the hospital in New England and the Midwest. (AP Photo/Steven Senne) A passer-by enters a pharmacy with a vaccination advisory attached to a door, right, Thursday, Dec. 2, 2021, in Worcester, Mass. As the U.S. recorded its first confirmed case of the omicron variant, doctors across the country are experiencing a more imminent crisis with a delta variant that is sending record numbers of people to the hospital in New England and the Midwest. (AP Photo/Steven Senne) A passer-by enters a pharmacy with a vaccination advisory attached to a door, right, Thursday, Dec. 2, 2021, in Worcester, Mass. As the U.S. recorded its first confirmed case of the omicron variant, doctors across the country are experiencing a more imminent crisis with a delta variant that is sending record numbers of people to the hospital in New England and the Midwest. (AP Photo/Steven Senne) A passer-by enters a pharmacy with a vaccination advisory attached to a door, right, Thursday, Dec. 2, 2021, in Worcester, Mass. As the U.S. recorded its first confirmed case of the omicron variant, doctors across the country are experiencing a more imminent crisis with a delta variant that is sending record numbers of people to the hospital in New England and the Midwest. (AP Photo/Steven Senne) A passer-by enters a pharmacy with a vaccination advisory attached to a door, right, Thursday, Dec. 2, 2021, in Worcester, Mass. As the U.S. recorded its first confirmed case of the omicron variant, doctors across the country are experiencing a more imminent crisis with a delta variant that is sending record numbers of people to the hospital in New England and the Midwest. (AP Photo/Steven Senne) A passer-by enters a pharmacy with a vaccination advisory attached to a door, right, Thursday, Dec. 2, 2021, in Worcester, Mass. As the U.S. recorded its first confirmed case of the omicron variant, doctors across the country are experiencing a more imminent crisis with a delta variant that is sending record numbers of people to the hospital in New England and the Midwest. (AP Photo/Steven Senne) A passer-by enters a pharmacy with a vaccination advisory attached to a door, right, Thursday, Dec. 2, 2021, in Worcester, Mass. As the U.S. recorded its first confirmed case of the omicron variant, doctors across the country are experiencing a more imminent crisis with a delta variant that is sending record numbers of people to the hospital in New England and the Midwest. (AP Photo/Steven Senne) A passer-by enters a pharmacy with a vaccination advisory attached to a door, right, Thursday, Dec. 2, 2021, in Worcester, Mass. As the U.S. recorded its first confirmed case of the omicron variant, doctors across the country are experiencing a more imminent crisis with a delta variant that is sending record numbers of people to the hospital in New England and the Midwest. (AP Photo/Steven Senne) A passer-by enters a pharmacy with a vaccination advisory attached to a door, right, Thursday, Dec. 2, 2021, in Worcester, Mass. As the U.S. recorded its first confirmed case of the omicron variant, doctors across the country are experiencing a more imminent crisis with a delta variant that is sending record numbers of people to the hospital in New England and the Midwest. (AP Photo/Steven Senne) A passer-by enters a pharmacy with a vaccination advisory attached to a door, right, Thursday, Dec. 2, 2021, in Worcester, Mass. As the U.S. recorded its first confirmed case of the omicron variant, doctors across the country are experiencing a more imminent crisis with a delta variant that is sending record numbers of people to the hospital in New England and the Midwest. (AP Photo/Steven Senne) A passer-by enters a pharmacy with a vaccination advisory attached to a door, right, Thursday, Dec. 2, 2021, in Worcester, Mass. As the U.S. recorded its first confirmed case of the omicron variant, doctors across the country are experiencing a more imminent crisis with a delta variant that is sending record numbers of people to the hospital in New England and the Midwest. (AP Photo/Steven Senne) A passer-by enters a pharmacy with a vaccination advisory attached to a door, right, Thursday, Dec. 2, 2021, in Worcester, Mass. As the U.S. recorded its first confirmed case of the omicron variant, doctors across the country are experiencing a more imminent crisis with a delta variant that is sending record numbers of people to the hospital in New England and the Midwest. (AP Photo/Steven Senne) A passer-by enters a pharmacy with a vaccination advisory attached to a door, right, Thursday, Dec. 2, 2021, in Worcester, Mass. As the U.S. recorded its first confirmed case of the omicron variant, doctors across the country are experiencing a more imminent crisis with a delta variant that is sending record numbers of people to the hospital in New England and the Midwest. (AP Photo/Steven Senne) A passer-by enters a pharmacy with a vaccination advisory attached to a door, right, Thursday, Dec. 2, 2021, in Worcester, Mass. As the U.S. recorded its first confirmed case of the omicron variant, doctors across the country are experiencing a more imminent crisis with a delta variant that is sending record numbers of people to the hospital in New England and the Midwest. (AP Photo/Steven Senne) A passer-by enters a pharmacy with a vaccination advisory attached to a door, right, Thursday, Dec. 2, 2021, in Worcester, Mass. As the U.S. recorded its first confirmed case of the omicron variant, doctors across the country are experiencing a more imminent crisis with a delta variant that is sending record numbers of people to the hospital in New England and the Midwest. (AP Photo/Steven Senne) A passer-by enters a pharmacy with a vaccination advisory attached to a door, right, Thursday, Dec. 2, 2021, in Worcester, Mass. As the U.S. recorded its first confirmed case of the omicron variant, doctors across the country are experiencing a more imminent crisis with a delta variant that is sending record numbers of people to the hospital in New England and the Midwest. (AP Photo/Steven Senne) A passer-by enters a pharmacy with a vaccination advisory attached to a door, right, Thursday, Dec. 2, 2021, in Worcester, Mass. As the U.S. recorded its first confirmed case of the omicron variant, doctors across the country are experiencing a more imminent crisis with a delta variant that is sending record numbers of people to the hospital in New England and the Midwest. (AP Photo/Steven Senne) A passer-by enters a pharmacy with a vaccination advisory attached to a door, right, Thursday, Dec. 2, 2021, in Worcester, Mass. As the U.S. recorded its first confirmed case of the omicron variant, doctors across the country are experiencing a more imminent crisis with a delta variant that is sending record numbers of people to the hospital in New England and the Midwest. (AP Photo/Steven Senne) A passer-by enters a pharmacy with a vaccination advisory attached to a door, right, Thursday, Dec. 2, 2021, in Worcester, Mass. As the U.S. recorded its first confirmed case of the omicron variant, doctors across the country are experiencing a more imminent crisis with a delta variant that is sending record numbers of people to the hospital in New England and the Midwest. (AP Photo/Steven Senne) A passer-by enters a pharmacy with a vaccination advisory attached to a door, right, Thursday, Dec. 2, 2021, in Worcester, Mass. As the U.S. recorded its first confirmed case of the omicron variant, doctors across the country are experiencing a more imminent crisis with a delta variant that is sending record numbers of people to the hospital in New England and the Midwest. (AP Photo/Steven Senne) A passer-by enters a pharmacy with a vaccination advisory attached to a door, right, Thursday, Dec. 2, 2021, in Worcester, Mass. As the U.S. recorded its first confirmed case of the omicron variant, doctors across the country are experiencing a more imminent crisis with a delta variant that is sending record numbers of people to the hospital in New England and the Midwest. (AP Photo/Steven Senne) A passer-by enters a pharmacy with a vaccination advisory attached to a door, right, Thursday, Dec. 2, 2021, in Worcester, Mass. As the U.S. recorded its first confirmed case of the omicron variant, doctors across the country are experiencing a more imminent crisis with a delta variant that is sending record numbers of people to the hospital in New England and the Midwest. (AP Photo/Steven Senne) A passer-by enters a pharmacy with a vaccination advisory attached to a door, right, Thursday, Dec. 2, 2021, in Worcester, Mass. As the U.S. recorded its first confirmed case of the omicron variant, doctors across the country are experiencing a more imminent crisis with a delta variant that is sending record numbers of people to the hospital in New England and the Midwest. (AP Photo/Steven Senne) A passer-by enters a pharmacy with a vaccination advisory attached to a door, right, Thursday, Dec. 2, 2021, in Worcester, Mass. As the U.S. recorded its first confirmed case of the omicron variant, doctors across the country are experiencing a more imminent crisis with a delta variant that is sending record numbers of people to the hospital in New England and the Midwest. (AP Photo/Steven Senne) A passer-by enters a pharmacy with a vaccination advisory attached to a door, right, Thursday, Dec. 2, 2021, in Worcester, Mass. As the U.S. recorded its first confirmed case of the omicron variant, doctors across the country are experiencing a more imminent crisis with a delta variant that is sending record numbers of people to the hospital in New England and the Midwest. (AP Photo/Steven Senne) A passer-by enters a pharmacy with a vaccination advisory attached to a door, right, Thursday, Dec. 2, 2021, in Worcester, Mass. As the U.S. recorded its first confirmed case of the omicron variant, doctors across the country are experiencing a more imminent crisis with a delta variant that is sending record numbers of people to the hospital in New England and the Midwest. (AP Photo/Steven Senne) Jehna Kottori, 10, of Worcester, Mass., prepares to receive a shot of the Pfizer COVID-19 vaccine, Thursday, Dec. 2, 2021, at a mobile vaccination clinic in Worcester. As the U.S. recorded its first confirmed case of the omicron variant, doctors across the country are experiencing a more imminent crisis with a delta variant that is sending record numbers of people to the hospital in New England and the Midwest. (AP Photo/Steven Senne) 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) Leah Perkins, of Worcester, Mass., center, stands in line to receive a booster shot of the Pfizer COVID-19 vaccine, Thursday, Dec. 2, 2021, at a mobile vaccination clinic, in Worcester. As the U.S. recorded its first confirmed case of the omicron variant, doctors across the country are experiencing a more imminent crisis with a delta variant that is sending record numbers of people to the hospital in New England and the Midwest. (AP Photo/Steven Senne) Jonathan Rodriguez, 6, of Worcester, Mass., focuses on a spinning toy as he receives a shot of the Pfizer COVID-19 vaccine, Thursday, Dec. 2, 2021, at a Worcester Department of Health & Human Services mobile vaccination clinic, in Worcester. As the U.S. recorded its first confirmed case of the omicron variant, doctors across the country are experiencing a more imminent crisis with a delta variant that is sending record numbers of people to the hospital in New England and the Midwest. (AP Photo/Steven Senne) 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) 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) 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) 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) 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) 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) 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) 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) 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) 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) 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) 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) 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) 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) 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) 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) 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) 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)