The pneumococcal vaccines only prevent pneumonia from certain strains of pneumococcus bacteria. These live in most people's throats all the time, in small numbers and may become virulent when immune system is impaired. We cultured each others throats in microbiology long ago and all of the class had this in their throats!
It is important to understand that other causes of pneumonia exist and the vaccine does not protect against them.
This link lists and explains the various types:
http://respiratory-lung.health-cares...onia-types.php
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All truths are easy to understand once they are discovered; the point is to discover them.-- Galileo Galilei
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Weezie looking at petunias 8.25.2017
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