New booster shots targeting the Omicron subvariants BA.4 and BA.5 could be rolled out within days. Here’s what to know about them.
With each mutation, the Covid-19 virus is becoming more transmissible. WSJ’s Daniela Hernandez breaks down the science of how Covid variants are getting better at infecting and spreading.
Illustration: Rami Abukalam, modified to better target recent versions of the Omicron variant as well as the ancestral strain of the coronavirus.cleared the shots from Pfizer Inc . and its partner BioNTech SE , and from Moderna Inc . for somea WSJ membership
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