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U.K. Prime Minister Boris Johnson on Friday announced that he is extending his time in self-isolation as he continues to have symptoms of the coronavirus -- a week after he tested positive for the highly contagious virus.

"Although I'm feeling better and I've done my seven days of isolation, alas I still have one of the symptoms, a minor symptom,” he said on a video message posted to Twitter.

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"I still have a temperature and so, in accordance with government advice, I must continue my self-isolation until that symptom itself goes."

Johnson tested positive for the virus last week, explaining to the public that he had developed "mild symptoms" -- "a temperature and a persistent cough."

Since then, the Conservative Party leader has been conducting government business remotely, as well as giving regular video messages to the public -- some of which he clearly appears to be suffering from symptoms of the illness.

BORIS JOHNSON TESTS POSITIVE FOR CORONAVIRUS

The U.K. is one of a number of countries that has taken drastic nationwide precautions to stop the spread of the virus, including closing down businesses and schools, as well as a nationwide stay-at-home order that only allows Brits outside for essential shopping and exercise.

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Johnson noted that warm weather was expected in the country this weekend, and urged Brits not to be tempted to break the rules and go outside -- even if they are going “stir crazy.”

“I just urge you not to do that, please please stick with the guidance now,” he said. “This country has made a huge effort, a huge sacrifice, done absolutely brilliantly well in delaying the spread of the virus, let's stick with it now.”