Fig. 1

Chart for patient grouping. A total of 200 children were included: 120 children who were hospitalised with HAdV pneumonia from June 2018 to December 2019, and 80 children with atopy and without HAdV infection who were selected as the control group. Based on the history of atopy, a total of 122 patients had atopy, both with and without HAdV infection, and 78 patients were non-atopic. There were 80 cases of mild pneumonia (30 atopic cases and 50 non-atopic cases) and 40 cases of severe pneumonia (12 atopic cases and 28 non-atopic cases). The 80 children with atopy and without HAdV infection were further divided into two groups according to disease severity (40 with mild pneumonia and 40 with severe pneumonia)