More personal anecdata: I got pneumonia three years back. A couple of weeks beforehand I'd run a 12km that I'd trained for over the three months prior. Once c

More personal anecdata: I got pneumonia three years back. A couple of weeks beforehand I'd run a 12km that I'd trained for over the three months prior. Once cleared of pneumonia (after another couple of weeks) I was puffing just walking 100 metres. And apparently, once you've had pneumonia, you're more susceptible to get it again. Something that didn't particularly help in my case was that I was prescribed an antibiotic that helps against "most" pneumonia causing bugs, but my pneumonia was actually caused by one of the less common bugs. Once put on the right antibiotic I felt much better within a day - after making no progress for two to three days on the original one. Pneumonia is no joke.