Federal regulators are expected to authorize the mixing and matching of COVID-19 booster doses this week in an effort to provide flexibility as the campaign for extra shots expands.
from https://www.reviewjournal.com/news/nation-and-world/us-likely-to-authorize-mix-and-match-covid-booster-shots-2462599/
from
https://calliduselctric.tumblr.com/post/665503660855492608
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