California releases smartphone virus tool as cases soar

Andrew Noymer, a public health professor at University of California, Irvine, questioned how many residents would opt in due to privacy concerns and the value of the tool if they don’t. He said people may find themselves paralyzed by a flood of information and it isn’t clear what they’ll do with it — especially if they take a coronavirus test after getting an alert and wind up negative, only to receive another alert. “In a purely epidemiological perspective, uptake is everything. If about 10% of people do it, it’s useless,” he said. “Even if it does get takers, it’s still unproven. Because then, what do you do?”