Since SARS-CoV-2 first emerged in late 2019, the virus has undergone a remarkable evolutionary journey. Over the course of the COVID-19 pandemic, successive variants—including Alpha, Delta and Omicron ...
Some viruses that make us sick are cleared by the immune system within days, while others lurk in our bodies for a lifetime and reemerge later to cause new problems. How and why viral levels in the ...
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