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UK Prime Minister Boris Johnson will remain in hospital on Monday after being admitted for "persistent symptoms of coronavirus," ten days after first testing positive for it.

The prime minister was admitted to St Thomas' Hospital in Westminster at 8pm on Sunday on the advice of his doctor after continuing to exhibit a high temperature, Business Insider reported.

A spokesperson insisted on Sunday that Johnson's hospital admission was not an "emergency" measure but had merely been for precautionary reasons in order to carry out tests.

However the Times of London newspaper reported that the prime minister was treated with oxygen on arrival.

Downing Street has repeatedly insisted that Johnson was only experiencing "mild symptoms" of the virus.

However, aides have reportedly become "increasingly worried" about the prime minister's health in recent days, according to multiple reports, with Johnson heard "coughing and spluttering" his way through conference calls.

Johnson was "more seriously ill than either he or his officials were prepared to admit," according to the Guardian, which reported a source suggesting that Johnson "was being seen by doctors who were concerned about his breathing."

The Sun newspaper reported a Downing Street source suggesting that Johnson would remain in hospital "as long as necessary."