Effectiveness of the COVID-19 messenger RNA vaccine against symptomatic omicron infection in children aged 6 months to 11 years in Japan.

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Title: Effectiveness of the COVID-19 messenger RNA vaccine against symptomatic omicron infection in children aged 6 months to 11 years in Japan.
Authors: Aizawa Y; Department of Pediatrics, Niigata University Graduate School of Medical and Dental Sciences, Niigata, Japan; Pediatric COVID-19 Vaccine Study Group in Niigata, Japan. Electronic address: yaizawa@med.niigata-u.ac.jp., Shobugawa Y; Pediatric COVID-19 Vaccine Study Group in Niigata, Japan; Department of Active Ageing, Niigata University Graduate School of Medical and Dental Sciences, Niigata, Japan., Tachikawa J; Department of Pediatrics, Niigata University Graduate School of Medical and Dental Sciences, Niigata, Japan; Pediatric COVID-19 Vaccine Study Group in Niigata, Japan., Ikuse T; Department of Pediatrics, Niigata University Graduate School of Medical and Dental Sciences, Niigata, Japan; Pediatric COVID-19 Vaccine Study Group in Niigata, Japan., Shin C; Pediatric COVID-19 Vaccine Study Group in Niigata, Japan; Shin Pediatric Clinic, Niigata, Japan., Ikarashi T; Pediatric COVID-19 Vaccine Study Group in Niigata, Japan; Ikarashi Pediatric and Allergy Clinic, Niigata, Japan., Okugawa T; Pediatric COVID-19 Vaccine Study Group in Niigata, Japan; Okugawa Pediatric Clinic, Niigata, Japan., Otsuka T; Pediatric COVID-19 Vaccine Study Group in Niigata, Japan; Otsuka Pediatric Clinic, Niigata, Japan., Sasagawa F; Pediatric COVID-19 Vaccine Study Group in Niigata, Japan; Sasagawa Pediatric Clinic, Niigata, Japan., Sakauchi M; Pediatric COVID-19 Vaccine Study Group in Niigata, Japan; Sakauchi Pediatric Clinic, Niigata, Japan., Sato M; Pediatric COVID-19 Vaccine Study Group in Niigata, Japan; Sato Pediatric Clinic, Niigata, Japan., Ino H; Pediatric COVID-19 Vaccine Study Group in Niigata, Japan; Seikyou Pediatric Clinic, Niigata, Japan., Ota M; Pediatric COVID-19 Vaccine Study Group in Niigata, Japan; Ota Kids and Allergy Clinic, Niigata, Japan., Kon M; Pediatric COVID-19 Vaccine Study Group in Niigata, Japan; Virology Section, Niigata Prefectural Institute of Public Health and Environmental Science, Niigata, Japan., Saitoh A; Department of Pediatrics, Niigata University Graduate School of Medical and Dental Sciences, Niigata, Japan; Pediatric COVID-19 Vaccine Study Group in Niigata, Japan.
Source: Vaccine [Vaccine] 2026 Apr 19; Vol. 79, pp. 128474. Date of Electronic Publication: 2026 Mar 16.
Publication Type: Journal Article
Journal Info: Publisher: Elsevier Science Country of Publication: Netherlands NLM ID: 8406899 Publication Model: Print-Electronic Cited Medium: Internet ISSN: 1873-2518 (Electronic) Linking ISSN: 0264410X NLM ISO Abbreviation: Vaccine Subsets: MEDLINE
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  Data: Effectiveness of the COVID-19 messenger RNA vaccine against symptomatic omicron infection in children aged 6 months to 11 years in Japan.
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  Data: <searchLink fieldCode="AU" term="%22Aizawa+Y%22">Aizawa Y</searchLink>; Department of Pediatrics, Niigata University Graduate School of Medical and Dental Sciences, Niigata, Japan; Pediatric COVID-19 Vaccine Study Group in Niigata, Japan. Electronic address: yaizawa@med.niigata-u.ac.jp.<br /><searchLink fieldCode="AU" term="%22Shobugawa+Y%22">Shobugawa Y</searchLink>; Pediatric COVID-19 Vaccine Study Group in Niigata, Japan; Department of Active Ageing, Niigata University Graduate School of Medical and Dental Sciences, Niigata, Japan.<br /><searchLink fieldCode="AU" term="%22Tachikawa+J%22">Tachikawa J</searchLink>; Department of Pediatrics, Niigata University Graduate School of Medical and Dental Sciences, Niigata, Japan; Pediatric COVID-19 Vaccine Study Group in Niigata, Japan.<br /><searchLink fieldCode="AU" term="%22Ikuse+T%22">Ikuse T</searchLink>; Department of Pediatrics, Niigata University Graduate School of Medical and Dental Sciences, Niigata, Japan; Pediatric COVID-19 Vaccine Study Group in Niigata, Japan.<br /><searchLink fieldCode="AU" term="%22Shin+C%22">Shin C</searchLink>; Pediatric COVID-19 Vaccine Study Group in Niigata, Japan; Shin Pediatric Clinic, Niigata, Japan.<br /><searchLink fieldCode="AU" term="%22Ikarashi+T%22">Ikarashi T</searchLink>; Pediatric COVID-19 Vaccine Study Group in Niigata, Japan; Ikarashi Pediatric and Allergy Clinic, Niigata, Japan.<br /><searchLink fieldCode="AU" term="%22Okugawa+T%22">Okugawa T</searchLink>; Pediatric COVID-19 Vaccine Study Group in Niigata, Japan; Okugawa Pediatric Clinic, Niigata, Japan.<br /><searchLink fieldCode="AU" term="%22Otsuka+T%22">Otsuka T</searchLink>; Pediatric COVID-19 Vaccine Study Group in Niigata, Japan; Otsuka Pediatric Clinic, Niigata, Japan.<br /><searchLink fieldCode="AU" term="%22Sasagawa+F%22">Sasagawa F</searchLink>; Pediatric COVID-19 Vaccine Study Group in Niigata, Japan; Sasagawa Pediatric Clinic, Niigata, Japan.<br /><searchLink fieldCode="AU" term="%22Sakauchi+M%22">Sakauchi M</searchLink>; Pediatric COVID-19 Vaccine Study Group in Niigata, Japan; Sakauchi Pediatric Clinic, Niigata, Japan.<br /><searchLink fieldCode="AU" term="%22Sato+M%22">Sato M</searchLink>; Pediatric COVID-19 Vaccine Study Group in Niigata, Japan; Sato Pediatric Clinic, Niigata, Japan.<br /><searchLink fieldCode="AU" term="%22Ino+H%22">Ino H</searchLink>; Pediatric COVID-19 Vaccine Study Group in Niigata, Japan; Seikyou Pediatric Clinic, Niigata, Japan.<br /><searchLink fieldCode="AU" term="%22Ota+M%22">Ota M</searchLink>; Pediatric COVID-19 Vaccine Study Group in Niigata, Japan; Ota Kids and Allergy Clinic, Niigata, Japan.<br /><searchLink fieldCode="AU" term="%22Kon+M%22">Kon M</searchLink>; Pediatric COVID-19 Vaccine Study Group in Niigata, Japan; Virology Section, Niigata Prefectural Institute of Public Health and Environmental Science, Niigata, Japan.<br /><searchLink fieldCode="AU" term="%22Saitoh+A%22">Saitoh A</searchLink>; Department of Pediatrics, Niigata University Graduate School of Medical and Dental Sciences, Niigata, Japan; Pediatric COVID-19 Vaccine Study Group in Niigata, Japan.
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  Data: <searchLink fieldCode="JN" term="%228406899%22">Vaccine</searchLink> [Vaccine] 2026 Apr 19; Vol. 79, pp. 128474. <i>Date of Electronic Publication: </i>2026 Mar 16.
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              Text: 2026 Apr 19
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