予備的研究ではあるが一応

【悲報】BA.2変異株、子どもが重症化や死亡しやすい事が明らかに　香港研究 [115996789]
https://greta.5ch.net/test/read.cgi/poverty/1648631695/

Study: Kids more likely to become severely sick with BA.2
https://www.wxyz.com/news/health/ask-dr-nandi/kids-more-likely-to-become-sick-with-ba-2-than-other-variants-hong-kong-study-shows
日本語 https://9ch.net/IgXNj

Severe outcomes in hospitalized children during the Omicron BA.2-dominated fifth wave in Hong Kong
https://www.news-medical.net/news/20220328/Severe-outcomes-in-hospitalized-children-during-the-Omicron-BA2-dominated-fifth-wave-in-Hong-Kong.aspx
日本語 https://9ch.net/hmp7s

Intrinsic Severity of SARS-CoV-2 Omicron BA.2 in Uninfected, Unvaccinated Children: A Population-Based, Case-Control Study on Hospital Complications
https://papers.ssrn.com/sol3/papers.cfm?abstract_id=4063036