Hi, i have a baby boy 3 years old , he got fever of 39 c , vomitting, diarreha. after admitting in hosp, stool test showed that he has pus/white blood cells 10-14 in stool , stool culture is positve for E coli, and klebsilla , he was recieved racophen five doses and flagyl, he got improved,but 2 days later he got diarrhea , and vomitting , and distended inflated tummy for 2 days. no fever only 37.3 through ear. His paedeatrition said he should take suprax and be admitted to check for typhoid or........... what is the differential diagnosis ? what should i do?