Moderna says its experimental COVID-19 vaccine that combines its original shot with protection against the omicron variant appears to work.
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COVID-19 vaccine makers are studying updated boosters that might be offered in the fall. Moderna says its combination booster candidate sparked an eight-fold increase in omicron-fighting antibodies.
Today's vaccines still offer strong protection against COVID-19 hospitalization and death but protection against milder infections wanes especially as the virus continues to mutate.
Health authorities are considering whether to order a change in the vaccine recipe.
