Hello there, I am dr.milan an infectious disease specialist answering your question. My suggestion for you is you go for culture & sensitivity test of stool sample of kid by a reliable Microbiology lab and by a qualified Microbiologist doctor. Onv you got the culture report you will going to know which organism is responsible for the infection and its sensitivity. In shigella generally very few drug is to be given according to international guidelines which are Ampicillin or amoxycillin, Co-Trimoxazole, Chloramphenicol, Quinolones and Aminoglycosides. So you need to find a suggested lab than you just visit your physician once with report.Hope i have given appropriate guidance to you. if you have any query you can consult me anytime. Give me star rating, helpful vote & thank you according to your satisfaction level. Thanking you.