| A common cause, but by no means the only one, is strep pneumococcus. There is a vaccination for this. Viruses , like influenza , can also cause pneumonia. A vaccination may also help.
You say you are in good health but the following put you at risk [if any apply ]
smoking
alcohol use
hiv / aids
cysic fibrosis
diabetes
[ prior ] removal of the spleen
steroids, chemotherapy suppress the immune system.
to name a few
usually one case is just that, but if you get pneumonia again you need to have your immunity evaluated by your doctor. |