<s>[INST] sir, 2 years ago my brother was suffereed from urine infection and kidney infection after operation all the infection is removed and then he is good in health .doctor say that all the checkups and test are done in 6 months .we do so .but from some time after two years of operation my brother is suffering from fever from 1 month.there is no positive result in M.C.U. test,maleria ,dengu, typhoid ,...doctors saying that his fever is due to body weakness . please suggest. [/INST] Dear Prashant, Fever is never due to weakness or unless there is an infection, so first you should rule out is it really a Fever, Buy a thermometer or anyway how measure daily temperature of your brother at least two times a day, if its above 98 F it's an infection if It's not then its weakness, From now onwards make your brothers diet rich in Proteins, Minerals, vitamins . e.g. Eggs, Meat, Soybean, Fruits, plenty of waterway Question? WelcomeRegards </s>