| The fast-spreading delta variant is clouding Americans' hopes for a carefree summer—and casting a shadow of doubt over plans to get back to business as usual in the fall. The shift in sentiment marks a reversal from the spring, when it looked like the U.S. immunization campaign would turn the tide definitively against the coronavirus. But lingering vaccine hesitancy in some areas has converged with the arrival of the more contagious delta strain and darkened the mood across much of the country. The delta variant recreates an anxiety that many had prior to being vaccinated, says Megan Ranney, an associate professor of health services, policy and practice at Brown University. "'Are we safe? Are our kids safe? Is it OK for me to go to a restaurant?' The things that we had started to accept were normal again."  Customers sitting in the outdoor dining section of a restaurant in the Little Italy neighborhood of New York. Photographer: Bloomberg/Bloomberg While U.S. health officials say delta is on its way to becoming the country's dominant strain, an analysis by genomic testing firm Helix suggests it's already there, accounting for about 40% of new infections. As hospitalizations rise in some states, the Biden administration is sending response teams to less vaccinated areas to try to combat its spread. Vaccines from Moderna, Pfizer, Johnson & Johnson and AstraZeneca give protection against delta, research shows. Yet for millions of unvaccinated Americans, largely concentrated in the south and central regions of the country, the variant presents a serious threat, Ranney says. Already, the variant has disrupted some nations' plans for a return to normal life. Prime Minister Boris Johnson pushed back the lifting of many U.K. restrictions by a month to mid-July and is now saying some precautions will remain even longer. Regions of Australia have responded to its spread with lockdowns. Gaps in knowledge around delta, such as how likely a fully vaccinated person who contracts the variant will transmit it, adds to the difficulty of making public-health decisions for a population fatigued by pandemic limits. —Elaine Chen and Rebecca Torrence
(In Sunday's newsletter, the percentage of people dosed in the least vaccinated U.S. counties was later corrected.) | 
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