Omicron Covid-19 variants BA.4 and BA.5 are on the rise in the U.S., adding two more highly contagious versions of the virus to the mix that has fueled a springtime surge in cases
Omicron subvariants appear yet more contagious than other versions of the virus causing latest case surge
If you’ve had Covid before, why can you get it again? WSJ’s Daniela Hernandez explains what the possibility of reinfections means for the future of public-health policy and the Covid-19 pandemic. Illustration: David FangOmicron Covid-19 variants BA.4 and BA.5 are on the rise in the U.S., adding two more highly contagious versions of the virus to the mix that has fueled aThe closely related subvariants represented a combined 13% of U.S.
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