CD40LG and pneumonia: Sex, comorbidities, outbreak wave, fever, respiratory symptoms, gastrointestinal symptoms, S IgM levels, S IgG levels, hospitalization days, and intensive care unit admission were not significantly different between pediatric patients with (27.7%, 95% CI: 65.6%-78.3%) and without pneumonia (72.3%, 95% CI: 21.7%-34.4%) (S2 Table).