Fever caused by viral and bacterial infections are generally not different, both can cause low or high fever in the body, but can be distinguished by other symptoms. Different viruses and bacteria invade the body, may cause the human body low or high fever symptoms, in this aspect is not easy to distinguish, but can be distinguished by other symptoms. Viruses cause fever symptoms, in addition to fever the rest of the symptoms are mostly concentrated in the nasal cavity and throat parts, such as nasal congestion, cough and dry throat and other conditions, while bacteria caused by fever, more sore throat obvious, yellow sputum and other symptoms. In addition, bacterial fever can be treated with antibiotics, while virus-induced fever requires antiviral treatment. If you have a fever that does not improve after 3 days, you should seek immediate medical attention to clarify the cause of the fever to avoid delaying your condition.