By Deidre McPhillips, CNN

(CNN) — As Covid-19 transmission ramps up in the United States, recent changes to federal vaccine guidance have left many Americans confused about the latest policies and concerned about access to shots this fall.

The US has had a summer surge in Covid-19 cases each year since the pandemic began. This year, however, experts say that the seasonal wave is starting later than anticipated and is relatively subdued. Surveillance data from WastewaterSCAN shows that median Covid-19 concentrations ticked up from June to July, with high levels in some parts of the country, but overall, it’s far below this time last year.

“My hypothesis was that the weak winter wave would set the stage for a bigger summer, because many people would not have recent immunity. So far, a

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