Most common serious infection was pneumonia (n = 164), with a median CRP of 48 mg/L (IQR 13–113), followed by gastroenteritis with DH (n = 162, median CRP 9.5 mg/L, IQR < 5–30) and complicated UTI (n = 58, median CRP 54.5 mg/L, IQR 22–127). Here, CRP is linked to susceptibility to pneumonia measurement.