Some people’s at-home Covid-19 tests are popping up positive at five, eight or even 10 days after their first symptoms or diagnosis. They might still be contagious.
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 FangSeeing that bright red line appear on an at-home Covid-19 test can feel inevitable during a surge likeThe Centers for Disease Control and Prevention recommends five days from first symptoms or diagnosis as a minimum isolation period before infected people
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