Viral infections and bacterial infections are two types of infectious diseases caused by different pathogens, and both may cause local or systemic symptoms after being infected. Take common respiratory tract infections as an example, they are different in the following aspects: 1. Bacterial infections are mostly accompanied by purulent secretions, resulting in symptoms such as yellow runny nose and yellow pus sputum, and fever may be accompanied by chills; 3, laboratory test indicators: routine blood tests for viral infections can be high or low, some patients may be normal, and the proportion of lymphocytes is high. Bacterial infections may have elevated white blood cells and elevated neutrophils. In addition, viral infections and bacterial infections attack different parts of the body, and may have different symptoms and treatment medication, it is recommended that the pathogen detection, clear type of infection before using antibiotics or antiviral drugs for targeted treatment, in order to achieve the best results.