Fig. 1

Timeline of infection prevention and control measures implemented in our hospital, per category. AGP = Aerosol generating procedures, ARDS = Acute respiratory distress syndrome, CI = Contact investigation, FFP = filtering face piece, GP = general practitioner, HCW = Healthcare workers, ICU = Intensive care unit, PPE = Personal protective equipment, RTI = Respiratory tract infection, m = meter. (a) Noord-Brabant is a neighboring province with a relatively high COVID-19 prevalence during the first wave. (b) Change from FFP-2 to FFP-1 masks in accordance to the national guideline at the time. (c) HCW who contacted their general practitioner for SARS-CoV-2 testing were referred to the municipal public health authorities. (d) Specific symptoms were: fever, coughing, shortness of breath, sore throat, and loss of sense of smell or taste. (e) Non-specific symptoms were: general malaise, fatigue, muscle ache, joint pain, gastrointestinal complaints and, pain behind the eyes. (f) Healthcare worker with a household member or partner with confirmed COVID-19 or with fever and respiratory symptoms. (g) China, Singapore, South Korea, Iran, Italy, Taiwan, Japan, Malaysia, Thailand, UAE, and Vietnam. From 10 March 2020 also the province of Noord-Brabant in The Netherlands