If you mean the pneumococcal vaccine, then you only need it once, unless you are unusually frail, as generally it will offer lifetime protection. Those that need boosters fall into the compromised immune system (eg HIV positive), chronic kidney disease, or you've had a splenectomy. If someone persuaded you you need it everytime you are traveling, and you are normally a healthy, not dying, person, I'm afraid they saw you coming. No particular health risk if you "over vaccinate". A meta study indicated: https://pmc.ncbi.nlm.nih.gov/articles/PMC6925972/ With bacterial vaccines, there isn't that much danger or flux in strain shift compared to viruses. Once a new strain appears, it generally stays in circulation. So yes to frequent reimmunisations against flu, because the way viruses naturally replicate will generate sero-variation. If you are looking at the old, but more widely available polysaccharide-base vaccines, go for the 23-valent shot (Pneumovax 23), not the 13-valent, if you can. 13 valent gives protection against only 13 strains. There are more recent Pneumococcal conjugate vaccines (eg. Capvaxive https://www.fda.gov/media/179426/download?attachment).
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