Some people are letting their guard down in the face of a Covid-19 variant that appears to cause largely mild illness. Health experts say risks remain.
Hyper-infectiousness and low disease severity convince some of diminished danger; health experts say risks remain
To fight Omicron surges, some countries are handing out second booster shots. In Israel, early data suggest a fourth vaccine dose can increase protection against Covid-19, but scientists aren’t sure how long it can last and some say additional boosters won’t help. Photo composite: Eve Hartley/WSJ
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