Moderna: Initial booster data shows good results on Omicron

In this file photo from August 15, 2021, vials of the Moderna COVID-19 vaccine are seen at the Assad Iben El Fourat school in Oued Ellil, outside Tunisa. (AP Photo/Hassene Dridi, file)
In this file photo from August 15, 2021, vials of the Moderna COVID-19 vaccine are seen at the Assad Iben El Fourat school in Oued Ellil, outside Tunisa. (AP Photo/Hassene Dridi, file)

Moderna says that a booster dose of its COVID-19 vaccine should offer protection against the rapidly spreading Omicron variant.

The drug company says lab tests show the half-dose booster shot increases by 37 times the level of so-called neutralizing antibodies able to fight Omicron. And a full-dose booster was even stronger, triggering an 83-fold jump in antibody levels, although with an increase in the usual side effects, the company says. (While half-dose shots are being used for most Moderna boosters, a full-dose third shot has been recommended for people with weakened immune systems.)

Pfizer’s testing likewise found its COVID-19 vaccine triggered a similarly big jump in omicron-fighting antibodies. The vaccines made by Pfizer and by Moderna, both made with mRNA technology, are used by many countries around the world to fight the coronavirus.

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