Cases in Arizona jumped by 5.5%, above the state’s average of a 4.4% daily increase over the past week.The current record rates of newly reported cases at 40,000 or more in recent days likely reflected a far bigger outbreak, Gottlieb said.Some encouraging signsBy the CDC’s own reckoning, the real number of infections was 5 to 10 times that being reported, Gottlieb said, and that meant the real rate of new infections was likely to be a “quarter-million” each day.Frieden said that while there were potentially encouraging signs in the growing share of younger people—who are less likely to suffer severe complications—among new reported cases, that shouldn’t be a reason to grow complacent.“What starts in the young doesn’t stay in the young,” he said, since younger people, often asymptomatic, can spread the coronavirus to more-vulnerable individuals including family members and co-workers.It was false to dismiss the recent surge in daily cases as a function of a ramping up in testing, Frieden said. A lower death rate was also potentially misleading, he said, with reported deaths likely to lag a surge in cases by about a month.