LONDON—British Primary Minister Boris Johnson, fighting a critical coronavirus an infection, was admitted to the intense treatment device of a London healthcare facility Monday night, leaving his country’s management in problem at a minute of deep disaster as the virus’s unfold accelerates.

As Mr. Johnson’s ailment worsened, he deputized his overseas secretary, Dominic Raab, to operate the authorities, a spokesman mentioned. The 55-calendar year-aged premier was conscious when he was wheeled into the intense treatment device of a central London healthcare facility at close to seven p.m….