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Data is suggesting that the protection from the primary series vaccination begins to drop around 4-5 months. Also, prior infection with Delta or one of the older variant viruses does not protect as well against infection with Omicron. You may be aware that there are more “breakthrough” infections without the booster dose. So, in order to achieve optimal personal protection and also community protection, we recommend that all people complete their booster dose vaccination as soon as eligible. This is being called maintaining your vaccination as “up-to-date”.