Where does “pneumococcosis” come from?

pneumococcosis (English) comes from English pneumococcus, from English pneumo-, from Ancient Greek πνεύμων, from Ancient Greek πλεύμων, from Proto-Indo-European pléwmō, from Proto-Indo-European plew- — to fly, flow, run.

pneumococcosis (English): Any of various diseases caused by pneumococcus (for example, pneumococcal pneumonia, pneumococcal sepsis, and pneumococcal meningitis)