COVID-19 vaccination figures more up-to-date through optimization of monitoring
Publication date 24-05-2022 | 15:00
Since 19 January 2021, the RIVM has been publishing weekly national and regional COVID-19 vaccination figures. As of 24 May 2022, the method for monitoring vaccination figures has been optimised and the population data has been updated. As a result, the figures provide a more up-to-date and better picture of the vaccination rate in the Dutch population. The optimisation process will adjust the vaccination rate.
Population data
As of today, the RIVM will use the population figures for April 2022. Until now, the population figures for 1 January 2020 were used. This made the RIVM consistent with the ECDC(external link), which also uses the data from that date. From today, people who were vaccinated but who have died or emigrated will no longer be counted. This gives a more up-to-date picture of the vaccination rate in the current Dutch population. The population figures are updated regularly.
Registered and estimated injections
The vaccination figures were based on the number of vaccinations registered by the GGD(Municipal health service). That number was supplemented with an estimated number of injections by other providers than the GGD (general practitioners, hospitals and institutions). The estimate was based on delivered vaccines. This was necessary because the registrations with providers other than the GGD were not yet complete at the start of the campaign.
COVID Vaccination Information and Monitoring System (CIMS) as a source
We use CIMS with the registered data as the basis for the vaccination figures. Using CIMS makes it possible to no longer include people who have emigrated or died. We no longer use estimates based on vaccines that have been administered. We supplement the source data with vaccination data from the GGD, which are not included in CIMS. This number is calculated for other implementers, with assumptions based on the GGD data. We now also take into account that one injection after a corona infection also counts as a completed basic series.
Vaccination rate adjusted
By using current population data and the optimized method, the vaccination rates over the totals come to other percentages. The turnout for the first shot of the basic series from 12 years is adjusted from 87.8% to 82.8%. The vaccination rate of the basic series (from 12 years) is adjusted from 84.9% to 82.0%. The booster vaccination rate is adjusted from 59.6% to 59.2%. The vaccination rate for the repeat shot is adjusted from 41.0% to 41.1%.
Further adjustments may be made in the future as population data are updated and source data and its processing are continuously improved.