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Chun JY, Jeong H, Kim Y. Identifying susceptibility of children and adolescents to the Omicron variant (B.1.1.529). BMC Med. 2022; 20:451.","DOI":"10.1186\/s12916-022-02655-z"},{"key":"2","unstructured":"2. Morimoto M, Tanaka M, Hori S, Shikata S. Sixth wave of COVID-19 pandemic: Epidemiological survey in children. Japanese Journal of Public Health. 2023; 70:749-758. (in Japanese)"},{"key":"3","doi-asserted-by":"crossref","unstructured":"3. Fukuda Y, Tsugawa T, Nagaoka Y, <i>et al.<\/i> Surveillance in hospitalized children with infectious diseases in Japan: Pre- and post-coronavirus disease 2019. J Infect Chemother. 2021; 27:1639-1647.","DOI":"10.1016\/j.jiac.2021.07.024"},{"key":"4","unstructured":"4. Yokota S. A report on infectious disease occurrence in a Japanese child care center situation. Bulletin of the Department of Nursing, Asahi University School of Health Sciences. 2019; 5:1-11. (in Japanese)"},{"key":"5","unstructured":"5. Hiramatsu T. 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Lancet. 2022; 399:2047-2064.","DOI":"10.1016\/S0140-6736(22)00478-0"},{"key":"31","doi-asserted-by":"crossref","unstructured":"31. Simon AK, Hollander GA, McMichael A. Evolution of the immune system in humans from infancy to old age. Proc Biol Sci. 2015; 282:20143085.","DOI":"10.1098\/rspb.2014.3085"},{"key":"32","doi-asserted-by":"crossref","unstructured":"32. Siegrist CA. The challenges of vaccine responses in early life: Selected examples. J Comp Pathol. 2007; 137:S4-S9.","DOI":"10.1016\/j.jcpa.2007.04.004"},{"key":"33","unstructured":"33. Haruta K, Ozaki T, Akano T, Takao H, Fukuda Y, Yoshikane A, Kito S, Noguchi T, Gotoh K, Takemoto K, Nishimura N. Clinical characteristics of pediatric patients with group A streptococcal isolates and antimicrobial susceptibility of the isolates in Japan, fiscal year 2017. The Journal of Pediatric Infectious Diseases and Immunology. 2019; 31:313-319. (in Japanese)"},{"key":"34","doi-asserted-by":"crossref","unstructured":"34. 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