They are closed because members of the public wanted them to be closed. If you look at this https://www.elsevierweekblad.nl/nederland/achtergrond/2020/03/tijdli

They are closed because members of the public wanted them to be closed. If you look at this https://www.elsevierweekblad.nl/nederland/achtergrond/2020/03/tijdlijn-coronacrisis-in-tweets-rivm-743404/ https://www.elsevierweekblad.nl/nederland/achtergrond/2020/0... you'll see a pattern of denial.