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Dr. Manjul Shukla transfers Pfizer COVID-19 vaccine into a syringe, Thursday, Dec. 2, 2021, at a mobile vaccination clinic 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.

The virology of the omicron variant

The 21st Show