Hi...my sister is suffering from a kind of fever which happens to come in every 2 or 3 year during the months of april or may and takes 2 to 3 months for treatment. Even if she is treated from best doctors, she gets fever as high as 103 or 104 degrees F. Doctors diagnosis shows symptoms of typhoid but even after typhoid treatment, she keeps on getting fever. It seems to happen with her since she was 9 years old. She is now 20 and facing the same problem now. Doctor is unable to find the cause of disease, even after all possible tests has been done. She shows on other symptoms beside high fever. So please anybody suggest me what is this case, whether it is some disease of anything else and what should i do.