I was wondering, what is the reason some vaccines provide a lifelong immunity against a disease while others require periodical shots to keep one immunised against a disease.
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1Welcome to Health.SE, user18849! Please take the tour and read the help center. What has your research shown you so far? Where have you already searched? Please help us to help you. You may improve your question to better comply with site guidelines with an edit and the help of How to Ask. Thanks!– LаngLаngСMay 20, 2018 at 10:49
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