Fever in bowel obstruction patient.

Sir, My father ,aged 68,he is a farmer. He has undergone a laproscopy surgery to remove intestinal blockage before 2 months from now. After surgery the report says there is small white nodules in intestine but not TB. Now 2 reviews completed. Doctor said now ok if diet is followed correctly. But today he has a fever of 100.7. Corona test is negative. Do we need to worry about this fever in connection to his bowel problem. As no medices are being taken after review. No stomach pain also. Can we give normal paracetamol or dolo 650 to him. If it is not just a fever ,what may be the reason for this fever. Any home remedies are ther for this before being admitted for such patients if suffers the fever.