Clinical characteristics of outpatients with influenza-B-associated pneumonia and molecular evolution of influenza B virus in Beijing, China, during the 2021-2022 influenza season.

"the ha and na gene sequences of the samples from this study were determined and deposited in the ncbi database with accession numbers or145863-145903 and or150157-150197."

"Declarations Ethical approvalThe study protocol was in accordance with the Declaration of Helsinki and was approved by the ethics committees of the Peking University People’s Hospital. We explained the details of our study to each subject, and written informed consent was obtained from all participants prior to their inclusion in the study. Conflict of interestThe authors declare that they have no conflict of interest. Conflict of interest The authors declare that they have no conflict of interest."

"Funding This study was supported by National Key Clinical Specialty Construction Projects and the Qi-Min Project. The funders had no role in the study design, data collection and analysis, decision to publish, or preparation of the manuscript."