With the delta variant surging throughout the U.S., Biden administration chief medical adviser Anthony Fauci has advocated for more testing — including for the vaccinated. More testing is essential, but how we test is important, too.

The U.S. is testing fewer people than it did in previous COVID-19 waves, and this is a problem. The now-dominant delta variant spreads so quickly that every missed opportunity to catch an infectious person can lead to many more new cases.

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