In many countries booster vaccinations have become available, and therefore patients and families ask questions as to whether and when to receive a booster vaccine. As the evidence is scarce, and even more so in the field of rare diseases, it is not simple to give sound and scientifically based advice. Furthermore, availability of vaccines may differ. It remains a priority to vaccinate all unvaccinated at-risk people. Nonetheless, here we give some recommendations to the best of our knowledge as of November 2021:
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