Two of his top aides in the fight against COVID-19 also say they have the disease.

LONDON — British Prime Minister Boris Johnson has tested positive for the new coronavirus, the first leader of a major nation to contract COVID-19, but he insisted Friday that he remains in charge of the U.K.’s response to the outbreak.

Two of Johnson’s top aides in the fight against the virus – his health secretary and top medical adviser – also said they had the disease.