Bacterial Toxins Blood Coagulation Factors Blood Proteins Child, Preschool Children Diarrhea, Infantile Dysentery, Bacillary Endothelium, Vascular Escherichia coli Infections Female GPIIbIIIa Glycoproteins HUS Hemolytic-Uremic Syndrome Humans Infant Male Microcirculation Platelet Aggregation Platelet Count Platelet Membrane Glycoproteins Platelets Shiga-Like Toxin I Spleen Thrombophilia Trihexosylceramides Uremic hemolytic syndrome article clinical article controlled study