A pub landlady phoned up 90 people to warn them that a weekend customer had tested positive for coronavirus.
The Lighthouse Inn pub in Burnham-on-Sea, Somerset, opted to close after the visitor came down with the disease.
Landlady Jess Green said the experience had been “stressful” after making her way through every person who had been in the pub after lockdown eased on Saturday and pubs were allowed to open their doors once more.
She told BBC Radio 4’s World At One programme: “The main thing that was going through our heads was we had to make sure everyone was safe, that we contacted everyone of our customers.
“We took it upon ourselves, because obviously Test and Trace can do all that, but we took it upon ourselves to do it because we knew that we had done it before it got out there.
“It took us all day, we finished at about 10 o’clock last night.
“Our (list) was about 90 and there were actually more but if they were in a social bubble or a household, we took the main person and they spoke to the people they were with, so it could have been more than that.”
When asked what the experience was like, she said: “Stressful – that’s probably the only word I can use.”
The Lighthouse Inn was one of three pubs which opted to shut after coronavirus cases were identified among their drinkers on the weekend.
Speaking in the House of Commons on Tuesday, Matt Hancock heralded the trio’s example as evidence that the test and trace system was working.
The Fox and Hounds in Batley, West Yorkshire, and the Village Home in Gosport, Hampshire, also reopened on what was dubbed “super Saturday” but have decided to close again after being notified of punters since testing positive for Covid-19.
Mr Hancock told MPs the pubs were “doing the right thing by their customers and by their communities”.
“This is NHS Test and Trace working precisely as intended,” he added.
“Three pubs shut so that others can be open.”
The Fox and Hounds in Batley said it would be closed until further notice after receiving a call from a customer on Monday to say they had tested positive for coronavirus.
Posting on its Facebook page, it said all staff had since taken a test and added that the pub will be “fully deep cleaned and when safe to do so we will reopen our doors”.
The Village Home in Gosport said it had also “had a case of coronavirus in the pub”, adding that “some of us are in isolation”.
Its statement on Facebook said: “The pub is now shut but all being well will open again on Saturday.
“Anyone who was in the pub over the weekend there is no need to isolate unless you show symptoms or are contacted direct by the trace group. Thank you and hope to see you soon.”
Downing Street said the closure of the pubs showed “just how seriously pubs and the public are taking their responsibilities to keep others safe”.