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Informed consent was obtained from all participants and from their legal guardians who were aged\u2009\u2264\u200916 years. Data were stored and analyzed anonymously. Inclusion criteria: \u2460 age\u2009\u2264\u200916 years old; \u2461 symptoms consistent with acute infection (at least one of the following): fever, chills, abnormal white blood cell distribution count (decreased or increased 5.0\u2009\u00d7\u200910^9\/L\u2009~\u200912.0\u2009\u00d7\u200910^9\/L); \u2462 clinical symptoms (at least one of the following): runny nose, coughing and sputum, wheezing, pharyngeal and laryngeal edema or soreness, chest tightness and chest pain, fatigue, abdominal pain and diarrhea. Nasopharyngeal swab specimens were collected by qualified medical staff of the sentinel hospitals in strict accordance with the monitoring program, and case information was collected. Specimens were stored at 4\u2103 for 24\u00a0h after collection and transported to the laboratory, and specimens sent for examination for more than 24\u00a0h were stored at -70\u2103.","order":2,"name":"Ethics","group":{"name":"EthicsHeading","label":"Ethics approval and consent to participate"}},{"value":"Not applicable.","order":3,"name":"Ethics","group":{"name":"EthicsHeading","label":"Constent for publication"}},{"value":"The authors declare no competing interests.","order":4,"name":"Ethics","group":{"name":"EthicsHeading","label":"Competing interests"}}],"article-number":"901"}}