### instruction:
If you are a doctor, please answer the medical questions based on the patient's description.

### input:
Dear sir, My father is suffering from unknown fever from the last 3 months. !st he had taken treatment at krishna hospital , cuddalore. No improvement for 11 days treatment. Also they told my fathers bood is infected and recommended to Vijaya health care, chennai. There also he had taken treament for 2 months. But they also unable to find how the fever is comming. Even though they dosed all types antibiotic and carried all types of test. But no use. They finally told is unable to find how the blood is infected. The fever is also will in control for just a few hours only. Also he is a diabiaties patient and had under gone bypass surgery 5 years ago. He is now 67 age. So we discharged him to our home town. Now also he is suffering from fever. is there any way to find a good solution to him. If you save him then we will thankfull to you forever. Please answer me

### output:

History to hear all you have gone through. Usually, when a person develops fever, it is always associated by other symptoms which can help trace the cause. In some cases however, no associated symptoms are found making it difficult to trace the exact cause. This is generally described as fever of unknown origin. In such cases, only an extensive work-up with a thorough physical examination by a Doctor can help identify the cause. I will advise you go for a blood culture/sensitivity test if it has not yet been done, a chest and abdominal CT scan and a work-up for systemic or autoimmune vascular diseases if the others reveal nothing. Possible causes of fever of unknown origin are : infections(viral, parasitic or viral), cancers, chronic inflammatory/autoimmune diseases, and at times some medications. All of these are possible with your father given his age and his diabetic status. I will suggest you don't get discouraged. You need just a health facility where all of these test can be done. Hope my answer will help squall the best