Moderna begins testing omicron-matched COVID shots in adults

Moderna has begun testing an omicron-specific version of its COVID-19 vaccine in healthy adults

The company announced Wednesday that the first participant had received a dose. Earlier this week, competitor Pfizer began a similar study of its own reformulated shots.

Moderna pointed to a small study published in the New England Journal of Medicine on Wednesday that showed antibodies able to target omicron persisted for six months after a booster dose, although the levels were dropping.

Moderna’s new study will enroll about 600 people who already have received either two doses of the company’s original shots or two plus a booster dose. All the volunteers will receive a dose of the experimental omicron-matched version.

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