Public health authorities in Toronto, Canada, warned on Friday that around 550 people may have been exposed to coronavirus after visiting a strip club in August.
It comes after an employee of the Brass Rail Tavern, on 701 Yonge St, tested positive to COVID-19.
The person has not been further identified, but Toronto Public Health contacted and urged all those in "close contact" with the person in question to self-isolate for 14 days and take a COVID-19 test.
Authorities also advised all those who attended the venue during the below time period "to monitor themselves for COVID-19 symptoms for the 14 days after their last visit".
It appears to be the first time the Canadian city has issued such a warning since it allowed nightclubs and restaurants to reopen - with social distancing restrictions - on July 31.
As of August 12, over 15,500 COVID-19 cases and more than 1,100 related deaths have been reported in Toronto.
People must still wear a face-covering in indoor public spaces, as well as stand two meters apart from each other - or wear a mask, if that is not possible.
Canada's COVID-19 cases have steadily decreased during the past month, but Ontario - Toronto's province - remains the worst-hit in the country after Quebec.
The country's border with the US will remain close at least for another month to non-essential travel, Public Safety Minister Bill Blair said on Friday.