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FDA expected to approve Covid booster for all adults

04:10

After some confusion over booster eligibility, the FDA is expected to approve Covid booster shots for all adults nationwide. Dr. Kavita Patel tells Lawrence O’Donnell that the need for a booster doesn’t mean the vaccine wasn’t effective. “This is a novel virus, we’ve never had a vaccine for it before. And as we’re learning – like many other viruses – we need at least three doses to constitute full immunity for at least a year.”