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
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.