What is the origin of the legionella bacteria are what are the risk?
The legionella preumophila bacteria is naturally occurring in surface water (even in drinking water). However to grow and multiply it needs nutrients, a place to grow like present in biofilm, and a water temperature between 20 to 55 degrees. If a group of legionella bacteria is released from the biofilm and the water in which it houses is sprayed and inhaled by people with impaired immune defence it can cause the feared legionnaires disease.
