10 questions about the Omicron variant — including its symptoms and spread — answered by an expert

• Dr. Leana Wen said the Omicron variant seems to be more contagious than Delta in South Africa.
• It has at least 50 mutations, which could make existing vaccines and therapies less effective.
• She urged people to get their booster shots and "stay flexible" about any holiday travel plans.

Dr. Leana Wen from George Washington University said the Omicron variant seems to be more contagious than the Delta variant in South Africa. It has at least 50 mutations, which could make existing vaccines and therapies less effective.

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