C-reactive protein, also known as hypersensitive C-reactive protein, is an acute temporal reactive protein produced by the liver. When an infection occurs in the body, the liver rapidly produces C-reactive protein and releases it into the peripheral blood, which increases the concentration of C-reactive protein in the peripheral blood. When there is bacterial infection or significant tissue damage, the C-reactive protein level will increase significantly, and when the infection is controlled, the C-reactive protein level will gradually decrease. Also, when there is significant tissue damage, such as severe burns, acute myocardial infarction, etc., C-reactive protein will also increase significantly, but when the body is infected with a virus, there is usually no significant increase in C-reactive protein. Therefore, the C-reactive protein test can also be used to make a differential diagnosis of viral or bacterial infections.