The state of Florida reported 11,365 new coronavirus cases over three days this past weekend — its three worst days on record. Orange County, home of Walt Disney World, reported 437 on Saturday — more than entire countries once considered epicenters of the pandemic. Test-positive rates topped 15 percent. Seven-day averages surged. And all of that, for an NBA attempting to finish its season at Disney in Orlando, is problematic, experts say. “Extremely concerning,” says Zachary Binney, an epidemiologist at Emory University. “Absolutely,” says Bill Schaffner, an infectious disease specialist at Vanderbilt University.