A FOURTH WAVE of covid-19 infections is washing across America. It is strongest in the heartland and southern states: cases per 100,000 people are highest in Louisiana, Florida and Arkansas; Missouri has the highest hospitalisations. But the rapidly spreading Delta variant threatens other places, too. Since vaccinations have stalled at around 155m adults, or 60% of the population aged 18 or over, few if any parts of the country have reached herd immunity. The new wave is likely to crash everywhere.

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