To understand the diagnosis and treatment status and medical burden of respiratory syncytial virus (RSV) infection in children in China, and to provide scientific basis for formulating prevention and treatment strategies for children. According to the seven administrative regions of China, namely Northeast, North, Northwest, Southwest, Central, South and East China, 1-3 children's medical institutions were selected from each region, and the cases of bronchiolitis or pneumonia admitted to hospitals and diagnosed as RSV positive by etiology during January 1, 2017 to December 31, 2021 were selected. Demographic data and clinical information were collected, and subgroup analysis was designed to explore the relationship between them and medical expenses and clinical treatment burden.

Inclusion Criteria:

Hospitalized patients under 18 years of age with an etiological diagnosis of RSV-positive bronchiolitis or pneumonia

Exclusion Criteria:

Inpatients under 18 years of age with an etiological diagnosis of RSV-positive bronchiolitis or pneumonia are excluded from any of the following criteria:

1. Pneumonia occurring 48 hours after hospitalization;
2. Combined with bronchial foreign body;
3. Participants in clinical trials of drugs or medical devices;
4. Not complete personal and family history and other relevant information.

According to the seven administrative regions of China, namely Northeast, North, Northwest, Southwest, Central, South and East China, 1-3 children's medical institutions were selected from each region, and the cases of bronchiolitis or pneumonia admitted to hospitals and diagnosed as RSV positive by etiology during January 1, 2017 to December 31, 2021 were selected. A total of 11 hospitals were selected, each with 100 children, a total of 1100 cases