British Prime Minister Boris Johnson was taken to the hospital on Sunday, 10 days after he tested positive for the coronavirus.

“On the advice of his doctor, the Prime Minister has tonight been admitted to the hospital for tests,” a Downing Street spokesperson said in a statement. “This is a precautionary step, as the Prime Minister continues to have persistent symptoms of coronavirus.”

The hospitalization was not an emergency admission, according to Downing Street.

Johnson, 55, announced March 27 that he was self-isolating after contracting the virus, noting that he has had a high fever and a persistent cough.

Before the virus accelerated in the United Kingdom, Johnson quipped that he shook hands with “everybody” at a hospital that was treating coronavirus patients. Johnson later placed the U.K. in a lockdown to try and halt the spread.