High ultrasensitive C-reactive protein in babies suggests an inflammatory response in the body, because ultrasensitive C-reactive protein is more sensitive than white blood cell count, and is often used in the differential diagnosis of bacterial and viral infections in the early stages of disease: 1. If ultrasensitive C-reactive protein is only mildly elevated, and the white blood cells and neutrophils are not high during routine blood tests, it is likely to be a viral infection. 2. 3. If the C-reactive protein is very high, it indicates a serious infection. If the bacterial infection is controlled after treatment, the ultrasensitive C-reactive protein will also drop rapidly, so the ultrasensitive C-reactive protein test can reflect the severity of the inflammatory infection and the effect of infection control in a more objective way.