As you know, the new COVID-19 Omicron bivalent booster is now available.   When is the best time to take this shot?   It depends.   Read this article for details . For those who took their last booster six months ago, plan to soon travel, or otherwise happen to be vulnerable, like elders, AS SOON AS POSSIBLE. In my case, I'm old, have a long trip coming up beginning on November 12, and live in a seniors' community.   Thus, 15 Craigside will arrange for these shots to be taken on our premises later this month.   For me, that's perfect, especially if taken at least two weeks before departure, which will be the case. But all my four vaccinations were of the Moderna version.   Should I stick to the same one, or expand to Pfizer? The CDC says it does not matter. Some studies of the earlier shots indicated that mixing vaccine brands actually may have produced a higher number of antibodies.  Moderna's earlier monovalent vaccines were slightly more effective than Pfizer's,