This 2020 electron microscope image made available by the National Institute of Allergy and Infectious Diseases shows a Novel Coronavirus SARS-CoV-2 particle isolated from a patient, in a laboratory in Fort Detrick, Md. The coronavirus mutant widely known as stealth omicron is now causing more than a third of new omicron cases around the world. But scientists still don’t know how it could affect the future of the pandemic. (NIAID/NIH via AP, File)
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