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Children who were infected with COVID-19 when the delta variant was the dominant strain last year tended to develop more severe symptoms compared to infections during previous waves, a study showed Tuesday.

During the delta wave in Japan between August and October of 2021, the proportion of children treated for COVID-19 in intensive care units and all children hospitalized due to COVID-19 infections was 14 times higher than that of such children between October 2020 and May 2021, before a surge in delta cases, according to the joint study by the National Center for Child Health and Development (NCCHD) and the National Center for Global Health and Medicine (NCGM).

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