This clinical trial is for children aged 6 to 11 with sudden diarrhea, possibly from bacteria. Diarrhea means having loose stools. The study compares two treatments: one group will take a medicine called rifaximin (200 mg) along with oral rehydration therapy (ORT), while the other group will only receive ORT. ORT helps to replace lost fluids, which is important when someone has diarrhea.

The study aims to find out how rifaximin moves in the body and if it is safe and effective for kids. Participants will take rifaximin or just ORT for 3 days. They will visit the clinic up to 4 times over 5 days and have 4 follow-up phone calls. Children in the rifaximin group will give blood samples on the first and third days to study how the drug is processed. All participants will provide stool samples to check for bacteria.

• The study requires up to 4 clinic visits and 4 follow-up phone calls over 5 days.
• Participants in the rifaximin group will give blood and stool samples.
• Participants will keep a diary of their stool frequency and any side effects.