Tests performed were as follows: blood test, including blood cell count and general biochemical tests (n = 54); measles IgM antibody titer (n = 54); chest X-ray for diagnosis for ruling out of pneumonia (n = 10); brain computed tomography scans for complicated febrile convulsion cases (n = 2); and abdominal ultrasonography for severe diarrhea cases (n = 12). Here, CD40LG is linked to susceptibility to pneumonia measurement.