What Should We Do About Persistent Diarrhea For 5 Days In A Toddler Despite Infusion And ORS?

Hi my son is 17 months old we are giving him Lectogen 2 since last 0ne year, since last 5 days he is suffering from deheria thin type, doctors have gave infusion & and ors respectively, but nothing helped so for, please suggest what to do, As he is countied with deheria so for,