https://www.wsj.com/articles/vaccine-makers-pursue-omicron-targeted-shots-that-health-officials-say-might-not-be-needed-11642161601

People received Covid-19 shots in Stamford, Conn., in December. So far in the pandemic, existing vaccines have remained effective against variants that have overtaken the initial virus strain.

Photo: Amir Hamja for The Wall Street Journal

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