Will vaccines roll out in time to stop emerging variants? Here's what experts say. ⋮ A more contagious variant of the coronavirus—called B.1.1.7, which was first discovered in the United Kingdom—has now been reported in all 50 states, leading to an uptick in novel coronavirus cases and warnings from health officials against easing restrictions aimed at curbing the virus's spread. Coronavirus cases continue to rise The daily number of newly reported U.S. coronavirus cases is climbing once again and is nearing the level of last summer's peak—although it's still significantly lower than the record peak reached this winter.