| PCR testing of all personnel |
Every 2–3 weeks for the duration of the outbreak, all personnel (except employees with previous positive SARS-CoV-2 PCR result) were repeatedly tested for SARS-CoV-2. |
| Use of surgical face masks |
All employees were provided with surgical face masks that they had to wear at the workplace (not during the breaks). |
| Physical distancing |
Where possible, workstations were separated by 1.5 m, and physical barriers were put between workplaces where separation was not possible. |
| Cleaning and disinfection |
Addition of more hand sanitisers and hand-washing stations, increased frequency of sanitisation of common spaces (canteen and changing rooms), and sanitisation of high-touch areas. |
| Adjustment of break times and shifts |
Separation between two shifts of 1 h. Staggering of break times to avoid crowding. Employees who worked in the same group could go on a break together. |
| Information and communication in different languages |
Team leaders speaking native languages of the employees communicated health promotion and infection prevention messages. |
| Daily entry symptom screening |
All employees were screened before they entered the workplace: temperature checks and questionnaire when symptoms were evident and isolation and testing of symptomatic employees for SARS-CoV-2. |
| Accommodation inspection |
Congregate accommodations were inspected to ensure that hygiene and infection prevention measures were implemented. |
