My mother is 80 years old, having fever from last one month which goes upto 103 f. Taken medication after consultation with doctors which was like, antibiotics: levoflox 500 mg for 3 days linospan 600 mg for 3 days gudcef 200 mg for continuous 10 days and few days on and off as suggested by doctor. These antibiotics were given along with paracetamol. Fever goes down during medication but comes back again once medicines are stopped. Done widal and malaria test which came negative. Cbc test was normal except wbc a little high tlc 12.31 thou/mm3. Urine protein and culture test also came negative except rbc 15-20 rbc/hpf and pus cells 3-4 wbc/hpf. Serum creatinine was normal. Can you please advise what kind of fever it is and why it's not going. What should we do, any other medicine which could cure it or any other tests required.