Experts are watching for a potential new COVID-19 surge in the U.S. — and wondering how long it will take to detect.
They say recent changes could hurt the nation's ability to see the beginning of a new wave. Those changes include how Americans are getting tests and a decision by federal officials to reduce the number of labs hunting to variants.
Health officials are increasingly focusing on hospital admissions, which rise only after a surge has arrived.
And a wastewater surveillance program remains a patchwork that cannot yet be counted on to fully understand coming surges.
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