Pfizer begins testing omicron-matched COVID shots in adults

    (AP) - Pfizer and BioNTech have begun studying a COVID-19 vaccine tweaked to match to the omicron variant in healthy adults.

    COVID-19 vaccine makers have been updating their shots in case global health authorities decide a change is needed.

    The study announced Tuesday will include more than 1,400 volunteers ages 18 to 55.

    Most already are vaccinated and will get boosters of the omicron-based vaccine or the original version.

    Some unvaccinated volunteers will get three omicron-based doses.

    The original vaccines still offer good protection against severe illness and death.

    And a booster improves the chances of avoiding even a milder infection.

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