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World Health Organization (WHO). Tetanus. Available at <https:\/\/www.who.int\/news-room\/fact-sheets\/detail\/tetanus>. Accessed March 31, 2026."},{"key":"2","doi-asserted-by":"crossref","unstructured":"2. Sudarshan R, Sayo AR, Renner DR, et al. Tetanus: recognition and management. Lancet Infect Dis. 2025;25:e645-e657.","DOI":"10.1016\/S1473-3099(25)00292-0"},{"key":"3","unstructured":"3. Denka Co., Ltd. Tetanus IgG "Seiken" package insert. Available at <https:\/\/www.denka.co.jp\/pdf\/product\/medical\/detail\/00334\/\u7834\u50b7\u98a8 IgG \u751f\u7814 12 \u7b87\u6708_231025.pdf>. Accessed March 31, 2026. Japanese."},{"key":"4","unstructured":"4. Japan Institute for Health Security. FY2023 Infectious Disease Epidemic Forecast Survey Report Available at <https:\/\/id-info.jihs.go.jp\/surveillance\/nesvpd\/report\/2023\/14.pdf>. Accessed March 31, 2026. Japanese."},{"key":"5","unstructured":"5. Fukui Prefectural Institute of Public Health and Environmental Science. FY2018 Infectious Disease Epidemic Forecast Survey Results (Diphtheria, Pertussis, Tetanus) Available at <https:\/\/www.erc.pref.fukui.jp\/center\/publish\/report\/2018\/3-3-2.pdf>. March 31, 2026. Japanese."},{"key":"6","unstructured":"6. Ministry of Health Labour and Welfare. Minimum Requirements for Biological Products of Japan. Available at <https:\/\/www.mhlw.go.jp\/content\/11120000\/001665320.pdf>. Accessed March 31, 2026. Japanese."},{"key":"7","doi-asserted-by":"crossref","unstructured":"7. Dierick JF, Halder Mc, Jungbaeck C, et al. The consistency approach for the substitution of in vivo testing for the quality control of established vaccines: practical considerations and progressive vision. Open Res Eur. 2022;2:116.","DOI":"10.12688\/openreseurope.15077.1"},{"key":"8","unstructured":"8. Winsnes R, Hendriksen C, Sesardic D, et al. Serological assays as alternatives to the Ph. Eur. challenge test for batch release of tetanus vaccines for human use. Dev Biol Stand. 1999;101:277-288."},{"key":"9","doi-asserted-by":"crossref","unstructured":"9. Iwaki M, Kenri T, Senoh M. An ELISA system for tetanus toxoid potency tests: an alternative to lethal challenge. Biologicals. 2023;82:101681.","DOI":"10.1016\/j.biologicals.2023.101681"},{"key":"10","unstructured":"10. International Council for Harmonization (ICH). ICH harmonized tripartite guideline Q2(R1): validation of analytical procedures: text and methodology. Available at <https:\/\/database.ich.org\/sites\/default\/files\/Q2%28R1%29%20Guideline.pdf> Accessed March 31, 2026."},{"key":"11","unstructured":"11. National Institute of Infectious Diseases. Tetanus vaccination status by age group, 2023. Available at <https:\/\/id-info.jihs.go.jp\/surveillance\/nesvpd\/2023\/tetanus\/yosoku\/vaccine\/>. Accessed July 9, 2025. Japanese."},{"key":"12","doi-asserted-by":"crossref","unstructured":"12. Gergen PJ, McQuillan GM, Kiely M, et al. A population-based serologic survey of immunity to tetanus in the United States. N Engl J Med. 1995;332:761-766.","DOI":"10.1056\/NEJM199503233321201"},{"key":"13","doi-asserted-by":"crossref","unstructured":"13. McFarland R, Verthelyi D, Casey W, et al. Non-animal replacement methods for human vaccine potency testing: state of the science and future directions. Procedia Vaccinol. 2011;5:16-32.","DOI":"10.1016\/j.provac.2011.10.002"},{"key":"14","unstructured":"14. Gupta RK, Siber GR. Use of in vitro Vero cell assay and ELISA in the United States potency test of vaccines containing adsorbed diphtheria and tetanus toxoids. Dev Biol Stand. 1996;86:207-215."},{"key":"15","doi-asserted-by":"crossref","unstructured":"15. Vermeulen M, Feck I, Francotte A, et al. Development of a multiplex immunoassay for characterization of diphtheria, tetanus and acellular pertussis antigens in combined DTaP vaccines. 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