FLiRT COVID Variants: What Are the Symptoms? NewsweekNew COVID variant 'FLiRT': What to know about spread, symptoms USA TODAYCOVID-19 variants called 'FLiRT' continue to spread across the US, CDC says KSAT San AntonioDoctors Warn About 2 New COVID Variants—What to Know About 'FLiRT' Strains Prevention Magazine