British Prime Minister Boris Johnson was in intensive care Tuesday with the coronavirus, while Japan’s leader declared a monthlong state of emergency for Tokyo and six other regions to keep the virus from ravaging the world’s oldest population.

The 55-year-old Johnson, the world’s first known head of government to fall ill with the virus, was in stable condition and conscious at a London hospital and was breathing without a ventilator or other assistance, said his spokesman James Slack. Foreign Secretary Dominic Raab was designated to run the country in the meantime.