In general, there is not really much difference between fevers caused by viral infections and fevers caused by bacterial infections. If there is a difference, it includes the following aspects: First, the child’s mental state is generally good when the fever is caused by a viral infection. If the fever subsides and the child is still able to eat, drink and play, in this case it is most likely caused by a viral infection. If the fever is caused by a bacterial infection, even if the fever has gone down, the child may still be in poor spirits, eat less, not want to play, be lazy, and have these symptoms. Next, observe the child’s other symptoms, such as the color of the child’s skin. If the child’s skin color is purple, appears patterned, especially gray these conditions, in fact, the disease is more serious. This category often suggests the possibility of a bacterial infection, but this is also based on symptoms alone and is not well grounded in evidence-based science. To identify the most common indicators are blood count and C-reactive protein, through these two tests, we can basically determine whether the fever is caused by a virus or a bacteria, which can guide us in the next step of treatment.