Hi and welcome to HCM.
First, you should treat uroinfection by antibiotics,especially if caused by staph.aureus. Postive blood culture
isnt good sign. It should be terated by i.v. drugs. Considering repeated fever
you should look for some other infection in the body. ALso there can be congenital urogenital anomaly which cause repeated infections and you should do ultrasounds and kidney
tests to evaluate this. Wish you good health.