Since 16 July 2020, doctors treating Covid-19 patients have provided the Federal Office of Public Health (FOPH) with information on where each infection may have occurred.
According to this data the most likely source of infection is a family member. 27% of recorded cases were reportedly infected this way. The next most likely sources were work (9%) and private parties (3%). Less likely sources included nightclubs, bars, medical staff and unplanned gatherings. These each accounted for around 2% of cases.
The percentages are based on forms submitted for 793 cases recorded between 16 July 2020 and 1 August 2020.
The FOPH data contrasts with data collected in Geneva, which suggests 40% of new cases in the week to 31 July 2020 in the canton were linked to 20 nightclubs.
However, given that 40% of the forms submitted to the FOPH indicated no source of infection the data is not particularly meaningful.