Corynebacterium + Dolosigranulum (cyan), Staphylococcus (black), Streptococcus (pink), and Moraxella (blue) were identified by hierarchical clustering and complete linkage approach. Bacterial genera with relative abundance >0. 1% was used for clustering analysis. Age group, presence of respiratory virus in the sample, and the annualized yearly rate of yellow zone episodes are annotated along each cluster. Source data are provided as a Source Data file.