The next variant: three key questions about what's after Omicron

[摘要] The number of SARS-CoV-2 infections is finally falling in some nations. But after two years of oscillating between pandemic surges and retreats, even people in these countries cannot help but wonder when the next blow will come - and what form it will take. Here are three key questions scientists would like to answer about the follow-up to Omicron.