Exposure to smoking in home (OR 2.53, CI 95%, 1.10–5.81), positive anti-Ascaris IgE levels (OR 2.79, CI 95% 1.58–4.92), RSV (OR 1.77, CI 95% 1.14–2.74), crepitation 3.06 (OR, CI 95% 1.19–5.23), and pneumonia (OR 2.54, CI 95% 1.31–4.89) were associated with severe bronchiolitis, Table 1. Here, IGHE is linked to susceptibility to pneumonia measurement.