Covid is surging across the US, with levels of the virus on track to exceed last summer’s wave nationally and approaching the peak of last winter’s wave in the west, according to wastewater data from the US Centers for Disease Control and Prevention (CDC).

Yet vaccination and antiviral uptake, plagued by inequitable access, have remained low, and other precautions like mask-wearing are being met with increasing resistance.

“A lot of people right now are getting Covid all over the country,” said Dr Peter Chin-Hong, professor of medicine and infectious disease specialist at the University of California, San Francisco. “There are still hospitalizations, and there’s still a few hundred deaths every week in the US – and that’s a tragedy.”

The rise is being driven by a trio of variants, called Flirt because of shared mutations, that seem to be more immune-evasive and transmissible. And much of the US has been locked in heatwaves, with many Americans staying indoors to avoid the heat – which can lead to more spread of the virus.

Nationally, emergency room visits for Covid increased by 15.7% in the past week. Rising hospitalization rates are now higher than last summer at this time, although it can be difficult to make comparisons now that […]