There are 2 different pneumonia shots, in my case spaced a year apart, then a follow-up booster in 5-6 years. I just had my first follow-up. As I understand it, the causes of death from flu and Covid is pneumonia. I trust the human data results in these shots over the years versus the yearly flu shots which are hit and miss (mostly miss) and Covid . Don't get me started there on Covid. I don't get anything injected into my body that doesn't have a track record of success. You might ask your doctor about the Prevnar vaccine for pneumonia.