The EU publishes monthly bulletins around DNA surveillance programs.
"The bulletin summarise the reported results and findings from European national wastewater surveillance programmes. It also informs about the local surveillance projects and non-EU countries participating as observers"
https://wastewater-observatory.jrc.ec.europa.eu/#/bulletin
Both kidney and spleen filter blood, although spleen is not essential and can be removed (splenectomy). Sacrificing the spleen, the surgeon used the spleen vessels to connect the kidney to the blood circulation. Reading the Italian news, the vessels of the other kidneys were in bad shape.