Zurich's health authority said on Saturday it had ordered a 10-day quarantine for almost 300 guests and staff of a nightclub after a reveller tested positive for the coronavirus and had been proven to have infected others during his outing.
The man was at the Flamingo Club on June 21 and tested positive for COVID-19 on June 25, the statement said. Five other people who were at the club with him have also tested positive since, it said.
As other European countries who have eased restrictions, Switzerland has seen a rise in new coronavirus infections.
This week, the number of new infections has increased daily from 18 on Monday to 69 on Saturday, according to the Health Ministry.
Swiss nightclubs were allowed to reopen this month, but they are obliged to register their guests.
"In case of further super spreader events, the closure of clubs must be considered," the Zurich health authority said.
Switzerland has recorded 31,555 coronavirus infections with 1,682 deaths so far, the ministry said.
The nightclub was not immediately available for comment.
(Reporting by Kirsti Knolle; Editing by Alison Williams)
