Hello, Welcome to Health Care Magic. I have gone through your query and I understand your concern. Your treating doctor that has told you that you might have a viral infection, has evaluated your overall condition and at the end has given the conclusion that the cough and fever is caused from a virus. Actually, we cannot decide to say that the causative microorganism might be a virus, without evaluating your overall condition and associated symptoms. Bacterial infections have normally more severe symptoms than viral infections. If you would have a kidney infection caused from a bacteria, you would have other related symptoms, and one of them wouldn t be the cough you have as a symptom. Hope I answered to your question. For further concerns feel free to ask again. Take Care, Dr. Ina Zaimi