Two central Vermont children have been hospitalized with apparent unrelated E. coli infections. A 5-year-old girl from Barre Town and a 3-year-old Randolph girl were being treated for kidney failure and remained on dialysis Monday. Both children were diagnosed with hemolytic uremic syndrome, a disease caused by certain strains of E. coli. The severity of the two case was unusual, said state Epidemiologist Patricia Tassler.