 It's back. COVID-19 surging in dozens of states thanks to a new variant called FLIRT. Even though cases are on the rise, though, health experts say that hospitalizations and deaths have been low. What we know is it's not causing different symptoms and it's not creating more severe disease. So ultimately, we're not increasingly worried, but we still have to continue to monitor these variants, understand the genetic makeup, but recognize that this is all part of the normal evolution of the virus. That's ABC News medical contributor Dr. John Brownstein.