If you're over 65, there’s a new vaccine you should know about. But before I explain the vaccine, let me introduce you to the bacterium that the vaccine protects you from. The little blue ovals in the above picture are Streptococcus pneumoniae bacteria. You might have guessed by its name that S. pneumoniae is a leading cause of pneumonia, and you'd be right. Pneumonia is an infection of the lungs, usually manifested by fever, productive cough, and shortness of breath. Pn...