It wasn’t clear what the rules are and what prompted the change, but it comes as China tightens its already strict COVID-19 travel restrictions in the face of a growing ...
When we penned the intro for this piece last year, little did we know that — in many ways — we’d still be deep in it by the time 2021’s feature rolled around. Amid another holiday season marred by a ...
We asked experts around the world what surprised them about SARS-CoV-2 and COVID-19, and what questions remain unanswered. Nature Medicine asks leading researchers to name their most anticipated ...
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