British Prime Minister Boris Johnson on Monday said he was in "good health" and had no COVID-19 symptoms ahead of his self-isolation.

Earlier in the day, Britain's National Health Service (NHS) Test and Trace had notified the prime minister that he must self-isolate, as Conservative MP Lee Anderson, who Johnson met on Thursday, tested positive for the virus.

In a video released on Twitter, Johnson said he would lead the virus response from his Downing Street home.

The news comes seven months after Johnson tested positive for the novel coronavirus in April and spent three days in intensive care.