Dr. Brad Spellberg, the chief medical officer at Los Angeles County + USC Medical Center, was eager to help do surveillance testing from the get-go. “If you don’t look at it, you’re missing the canary in the coal mine,” he says. “You’re waiting for the coal mine to collapse on you.”

Dr. Brad Spellberg, the chief medical officer at Los Angeles County USC Medical Center, was eager to help do surveillance testing from the get-go. “If you don’t look at it, you’re missing the canary in the coal mine,” he says. “You’re waiting for the coal mine to collapse on you.”