I believe it could be a precautionary measure. If you weren't vaccinated as a child then your markers could show low. Or you could be right and you are more susceptible, but then most of us with Lung disease are. Hope this helps, maybe someone with more detailed knowledge will be able to help.
The Prevenar 13 injection is an additional Pneumonia vaccine to the Pneumovax. It is a good thing you are having it. Keep up with all your flu vaccines as well. I had it because I have not developed sufficient antibodies against the different strains.
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