Hi, Thanks for writing in. Typhoid fever is caused by bacteria salmonella. It is spread through contaminated water and food. Recovery takes time but symptoms can re appear because bacteria can persist in the body. Children should be advised rest and healthy food for a while. They must be told to wash hands before having meals and drink clean water. Less oil must be used in cooking and boiled vegetables are preferable. This is because the intestines need time to recover from infection. Any pain in abdomen and diarrhea must be reported to the doctor. If there is re infection, which is seen in many patients, I suggest another course of allopathy medications and this will cure the infection almost completely. Hope this helps