Legionella oppstår hovedsakelig i miljøer med stillestående vann og høye temperaturer som gir gode vekstbetingelser.
Bakterien smitter gjennom spredning av små vanndråper (aerosoler). Det er derfor viktig å følge opp installasjoner som kan spre slike vanndråper. Vanlige smittekilder er dusjanlegg, boblebad, kjøletårn og andre systemer hvor vannet er stillestående og har høy temperatur.
Legionella finnes i små mengder over alt i naturen, men det er først når de formerer seg og får optimale vekstvilkår at de kan medføre smittefare. Infeksjon av legionella fører til legionærsykdom og har like symptomer som lungebetennelse. I bygg og anlegg trenger legionella biofilm for å vokse. Gode renserutiner vil derfor kunne motvirke vekst av bakterien.
Forskrift om miljørettet helsevern, kapittel 3a Krav om å hindre spredning av Legionella via aerosoler beskriver hvilke krav som gjelder til virksomheter og eiendommer som direkte eller indirekte står i posisjon til å spre legionella via aerosoler, utendørs eller innendørs.
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