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**TAK-361S** was Takeda's investigational pediatric combination vaccine designed to prevent diphtheria, pertussis, tetanus, and poliomyelitis. It combined diphtheria-tetanus-acellular pertussis vaccine components with Sabin-strain inactivated poliovirus vaccine and was evaluated as a repeated subcutaneous vaccination regimen in healthy Japanese children aged 3–67 months in a Phase 2 dose-finding study. Takeda voluntarily discontinued development of the program in February 2015 following vaccine-portfolio prioritization. ([jrct.mhlw.go.jp](https://jrct.mhlw.go.jp/en-latest-detail/jRCT2080221634))
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