WASHINGTON — US biotech company Moderna on Wednesday announced positive results for a new vaccine that targets both the original Covid-19 strain and Omicron, and sees the shot as its"lead candidate" for a booster this fall.
All of the participants previously received three doses of Spikevax, and then slightly more than half went on to get a fourth dose of the bivalent shot while the rest got another dose of Spikevax.The group that got the new shot also received slightly superior protection to the ancestral strain of Covid-19 compared to Spikevax — though original Covid-19 has long since disappeared from circulation.
Moderna did concede that antibody levels would be lower against Omicron's sub variants that are now in circulation, but said it believed it was still a superior booster than repeating Spikevax. The problem of an ever-evolving virus poses a challenge for health authorities. A panel of Food and Drug Administration experts will meet June 28 to discuss considerations and strategies for boosters in fall and winter.
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