*10.6. Legionella*

Legionnaires' disease is commonly associated with thermally polluted waters [155]. Due to the relationship between temperature and the occurrence of *Legionella* spp. in water, one might expect an increase in cases or outbreaks associated with climate change. Studies indicate that temperature and humidity [156,157], or vapour pressure [158], may play a role in the occurrence of sporadic disease. Due to concerns about the multiplication of *Legionella* spp. at the consumer endpoint (taps and showers) the European Drinking Water Directive has been modified to include a risk assessment for this pathogen. A SR on cooling towers related to Legionnaires' disease provided quite detailed advice on risks and their mitigation [159]. As climate changes becomes more apparent, there may be improvements in our understanding of previously unrecognised transmission routes from the natural environment.
