Blood, hematopoietic organs-immune system (D50-D90).
- Hemolytic uremic syndrome (HUS) – triad of microangiopathic hemolytic anemia (MAHA; form of anemia in which erythrocytes (red blood cells) are destroyed), thrombocytopenia (abnormal decrease in platelets/platelets), and acute kidney injury (AKI); Mostly occurring in children in the context of infections; most common cause of acute renal failure requiring dialysis in childhood.
- Thrombocytopenia (reduction of blood platelets), idiopathic (without apparent cause).
Cardiovascular system (I00-I99).
- Other vasculitides (vascular inflammation).
Infectious and parasitic diseases (A00-B99).
- Meningococcal sepsis (blood poisoning caused by the bacterium Neisseria meningitidis).
Musculoskeletal system and connective tissue (M00-M99).
Neoplasms – tumor diseases (C00-D48)
- Leukemia (blood cancer)
