My son has prolonged fever. All tests have been done, right from urine culture, urine complete, malaria, dengue, widal, ultrasound scan,x-ray. Awaiting the results of leptospirosis,blood culture and mantoux. His fever reduces in about 1 1/2 hrs of giving paracetamol but shoots up in another 6 hrs. He's been given antibiotics. He has no cold or cough. But he has chills rarely.