Hi, My son (30 yrs old), is suffering from low grade fever for the last 10 days. In the morning his temperature is 97.8 and at afternoon (1-12 pm) it is 98.6. After that any time between 1 to 3 PM it rises to 99.2 and at night its is again 98.8. He has lower backache, lags paining fatigue and heaviness on the head. The doctor has diagnosed it as viral fever. He is taking Cetodem AZ for the last 10 days. But the fever pattern is the same. Kin dly explain the reason and treatment and if any test is required. He had done Widal test, but it is negative (1/40) only. Please help we are very much worried now.