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The pneumonia shot is for Pneumococcal pneumonia (aka Streptococcus Pneumoniae), so it would help to head off a pneumococcal pneumonia, but not a pneumonia caused by a different kind of bacteria. Bottom line: it helps, but won’t totally protect, as there are many different organisms which cause pneumonia (although Pneumococcal is one of the most common AND most deadly; it’s what killed Jim Henson).