SARS-CoV-2 (shown here in an electron microscopy image). Credit: National Institute of Allergy and Infectious Diseases, NIH

A number of countries tightened anti-coronavirus measures on Saturday, with France extending a curfew and Belgium bringing forward its own, as Germany’s death toll passed 10,000 and the US reported 80,000 infections in a single day.

In the Belgian capital Brussels, authorities moved up their curfew by an hour, and in Poland, President Andrzej Duda tested positive for COVID-19.

The World Health Organization has warned of an “exponential” rise in infections threatening health systems’ ability to cope.

But populations weary of