Hello Rakesh. Im sorry to hear that about your son. Did the fever only start today? How is he after you give the fever medicine? Is he active and eating well? Fever can be due to a viral or bacterial infection. Aside from the throat pain, does he have colds or cough? For most viral infections, the patients appear well after given antipyretic (fever medicine like Ibugesic or Paracetamol) in between fever episodes. The throat infection caused by viruses is usually accompanied by colds. Viral infections are not given antibiotics like Clarithromycin or Crixan. It is mainly supportive like giving fever medicine, lots of fluids, antibacterial gargle. Fever caused by viral infections can last from 3 days to a week. After 3 days, you will notice the fever to go down and the patient will show improvement already. You may try to check his throat to see if the tonsils are red and swollen sometimes with streaks of pus. If you see this, chances are the throat infection is caused by a bacteria like streptococcus or what we call as the strep throat. Patients who have strep throat can also have severe headache, difficulty swallowing, sometimes with rashes. Bacterial throat infection will be more sick looking compared to that caused by viruses. For this you will need antibiotics that is properly computed based on your child s weight. I hope I was able to help you. Sincerely, Hannalae Dulay-See, M.D. Pediatrics