The United Kingdom is preparing for one of its largest pandemic exercises...

The United Kingdom is preparing for one of its largest pandemic exercises, codenamed Pegasus, a nationwide test of how the country would handle a fast-moving respiratory outbreak.

Pegasus is built for the realities of a 21st-century pandemic—where information can spread faster than the virus and public trust can decide containment.

It will also examine how global shortages and geopolitics determine who gets life-saving supplies.