Labour leader Sir Keir Starmer is self-isolating at home again after a member of his private office staff tested positive for coronavirus.
Sir Keir, 58, is doing "well" and isn't displaying any symptoms, a spokesman for Labour said.
The party leader will be working from home until his period of self-isolation ends, the spokesman added.
He was pictured visiting the Portsmouth Gin Distillery in Southsea, Portsmouth, along with shadow chancellor Anneliese Dodds on Thursday.
It comes just weeks after Prime Minister Boris Johnson was forced to self-isolate at his residence in Downing Street for two weeks after having close contact with Tory MP Lee Anderson, who later tested positive for Covid-19.
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A Labour spokesperson said: "This afternoon, Keir Starmer was advised to self-isolate after a member of his private office staff tested positive for the coronavirus.
"Keir is well and not showing any symptoms.
"He will now be working from home."
It is understood Sir Keir will stay at home until December 16 - 14 days after he last came into contact with the staff member concerned last Tuesday.
It is the second time he has been forced into self-isolation.
In September, he isolated at home after one of his children displayed "possible symptoms" of the virus.
He was able to end his quarantine period when the child's coronavirus test came back negative two days later.
The latest period of self-isolation comes at a critical time for the UK - the country is set to roll out a Covid-19 vaccine on Tuesday amid ongoing criticisms of the Government's handling of the pandemic, and Brexit talks between Britain and the EU have stalled.
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Labour is split over how to respond to a Brexit deal if it reaches the Commons, with senior figures at odds over whether to support it or abstain.
Sir Keir has confirmed there are differing opinions within the party on its approach to voting on a Brexit deal, but stressed that a trade agreement with the European Union was "in the national interest".
Sir Keir said: "Of course there are different opinions, as you would expect, but we will pull together, discuss it as a team and be united."