39 BA.5, now dominant U.S. variant, may pose the biggest threat to immune protection yet...The FDA recommended that Covid vaccine makers target two omicron subvariants — BA.4 and BA.5 — in new booster shots expected to come this fall. **** Preparation for mail-in ballots? (www.nbcnews.com) posted 2 years ago by Taffy333 2 years ago by Taffy333 +39 / -0 6 comments share 6 comments share save hide report block hide replies
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