*The daily number of unique survey participants reporting a positive COVID-19 test, summed up for the entire calendar week (Monday through Sunday). The positive test result could come from a self-test, PCR test or rapid antigen test. The percentage of participants who get a COVID-19 test when they have symptoms may fluctuate over time. These results are not from the nose and throat swabs sent in through the self-test study that started in September 2022.

**The National Coordination Centre for Patient Distribution (LCPS) reports the number of newly admitted patients with SARS-CoV-2 in hospital nursing wards. These reports are provided on working days, covering the period between 10:00 on the previous day and 10:00 on the reporting day. The day before the reporting day is considered to be the admission date. RIVM calculates the average number of newly admitted patients in the nursing ward and the average number of beds occupied in the nursing ward and ICU per day for a calendar week (Monday to Sunday) by adding the number of patients or number of occupied beds per admission day in a calendar week and dividing by the number of admission days for which these new admissions are reported.

Data of 2019/2020 season is available from week 14 of 2020. Week 53 of 2020 is not included in this figure. 

Based on data available at RIVM on Wednesdays, as published in the open data and presented on the Coronavirus Dashboard. See the webpage about Sewage water surveillance for the most recent data. See the explanation of the data presented for more details about how these figures are calculated. 

The daily number of unique survey participants reporting a positive COVID-19 test, summed up for the entire calendar week (Monday through Sunday). The positive test result could come from a self-test, PCR test or rapid antigen test. These results are not from the nose and throat swabs sent in through the self-test study that started in September 2022. Source: Infectieradar RIVM.