Widespread vaccinations have significantly decreased the number of tetanus cases in developed countries. Today, most cases of tetanus affect the elderly and those with inadequate immunization in developed countries such as Japan. As vaccinations were believed to be nearly 100% effective in preventing tetanus, tetanus in young, immunized individuals were considered unlikely. However, unexpected tetanus infection has been reported in young adequately immunized individuals.
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Okuda et al. (2024) studied this question.
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