if its due to salmonella
then it can be surely cured by antibiotics, and most imp thing is if they are given after stool culture as there are many resistant bacteria in the community !
The more important thing you have to keep in mind along with drugs is the hydration of patient.
The patient should take plenty of fluids, along with salts and minerals, as most of chronic diarrhoea patients suffer from either dehydration
or with mineral balance in body !
hope my info helped you
Dr Hari Om Chandrakar