Information – How Many Legionella Species Exist & Which Ones Cause Legionnaires’ Disease?

Legionella Control 

While there are more than 50 different recognised Legionella species, less than half of those can cause illness in humans. However, while around 20 species are known to be harmful to us, just one has been identified as the cause of most outbreaks of Legionnaires’ disease. Read further at the link above.