Health Experts Warn Of New Omicron Subvariants As Winter Approaches

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As winter approaches, health experts are warning of new Covid-19 Omicron subvariants that are able to dodge immune defenses, posing a threat to both vaccinated and previously infected people. NBC News medical fellow Dr. Akshay Syal breaks down whether the new Omicron subvariants could cause a spike in cases and whether Covid-19 vaccine booster shots can still protect people against the virus.

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