For 111 cases (26.7%), preexisting immunocompromization/-suppression was reported: 92 were on immunosuppressive medication, 61 of them due to a solid organ transplantation; 14 were HIV positive, 10 of them with a reported low CD4 cell count or AIDS defining conditions; three had a splenectomy; one chronic renal failure; one was described as immunosuppressed by the authors without further explanation. Here, CD4 is linked to chronic kidney disease.