Kinsa Health has sold or given away more than a million smart thermometers to households in which two million people reside, and thus can record fevers almost as soon as consumers experience them.

The thermometer data “acts as an early warning system for illness spreading,” said Inder Singh, the company’s founder. The C.D.C.’s system lags because it relies on weekly reports from hundreds of doctors’ offices and hospital emergency rooms about what symptoms they are seeing in patients.

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