My 75 year old mother has had a fever for 8 days now along with fatigue and achiness, She has been tested for the flu and strep, negative results. On the 4th day, she went to her doctor and he said she had high levels indicating a urinary tract infection and was given Cipro. This past Friday, she was given another urinalysis and he said it was clear. She had a normal temperature at that time, but she has been taking fever reducers every 4 hours alternating between ibuprofen and acetaminophen. Her fever went back up Friday evening when she didn't take a fever reducer. My question is this: If her urine was clear, could she still an infection causes the fever, or is it likely another cause.