The patients were tested late so the health authorities only learned of the infections several days later. In addition, it was discovered that others had hidden symptoms present before and during the festivities.
Christiane Meier, the interim head cantonal doctor, told the newspaper that a potential super spreader should be considered a possibility.
At this stage it is not clear how many were infected in the club, which closed following the event without giving a reopening date.
Zurich has already had two cases of super spreaders of the virus. At the end of June 2020, five people tested positive in another night club, forcing 300 people to quarantine.