Polymorphisms of IFN signaling genes and FOXP4 influence the severity of COVID-19.

"Declarations Ethics approval and consent to participateThe study was performed in accordance with the principles of Declaration of Helsinki. All the work was approved by the biomedical research ethics committee, the public health school (Shenzhen) of Sun Yat-sen University (Public Health (Shenzhen) Medical LUN (2020) No. 007, Sun Yat-sen University). Patients were informed about the surveillance, and data were collected and anonymized for analysis. Informed consent was obtained from all participants in this study or their legal guardian/next of kin under 16. Consent for publicationNot applicable. Competing interestsThe authors declare no competing interests. Competing interests The authors declare no competing interests."

"Funding This study was supported by the National Natural Science Foundation of China (Grant number:8204100563), Shenzhen Science and Technology Program (Grant number: JCYJ20200109142438111), and Guangdong Basic and Applied Basic Research Foundation (Grant number: 2023A1515011767)."