The European Union recommended a pause on all non-essential travel from the US as Covid-19 cases surge.
The daily average for hospital admissions has risen past 100,000 for the first time since last winter.
The recent wave, driven by the Delta variant, is most severe in the US South but cases are rising nationwide.
Monday’s guidance from the 27-nation bloc reverses advice from June that lifted restrictions on American travellers ahead of tourism season.
