A low platelet count, or thrombocytopenia, is a condition that should always be diagnosed and treated by a medical professional immediately. The reasons for a low platelet count include leukemia, medication issues, autoimmune diseases, pregnancy, or bacteria in the blood, according to Mayo Clinic.
Other rare but serious causes of thrombocytopenia include ITP, which causes the body to mistakenly form antibodies that attack the platelets, or hemolytic uremic syndrome, which causes the destruction of red blood cells and a decrease in kidney function. E. coli may be the cause of hemolytic uremic syndrome. Low platelet counts can cause serious complications. A person with this condition requires medical attention, states Mayo Clinic.