Why Covid is surging this summer – and what health experts say has changed

President Biden’s positive test for Covid-19 on Wednesday is a sign of a broader trend: Covid cases are rising this summer, as measured by rising wastewater measures and an increase in hospitalizations.

Many Americans have likely experienced the uptick firsthand in recent weeks. They have tested positive themselves or know that someone else is annoyed by seeing those two lines during a home test. Even as SARS-CoV-2 has joined the ranks of respiratory viruses that will continue to circulate and cause infections, a spike in cases like this summer’s is still causing disruptions to people’s lives — as well as some confusion over things like tracing of tests, the best time to get vaccine boosters, and the latest advice on controlling the infection.

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