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An infectious disease expert also touches on expanded booster authorization, the omicron variant and precautions for holiday gatherings.

An infectious disease expert also touches on expanded booster authorization, the omicron variant and precautions for holiday gatherings.

The infectious disease expert at Mass General also touches on expanded booster authorization, the omicron variant and precautions for holiday gatherings.

A new laboratory study suggests two doses of Pfizer's COVID-19 vaccine may not offer enough protection against omicron coronavirus variant.

The CEO of Pfizer says people who are fully vaccinated with the company's vaccine now need a booster in order to neutralize the risk from the omicron variant.

The chief of infectious diseases says the omicron variant is not the reason for the spike in cases.

An infectious disease specialist in Massachusetts says evidence from South Africa shows the omicron variant took off even more rapidly than previous variants.

Dr. Ali Raja, of Mass General, also discusses whether he expects to see coronavirus-related hospitalizations and deaths on the rise.

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The World Health Organization says the omicron COVID-19 variant poses a very high risk to global health.