Legionella disease or legionellosis is a infectious disease that affects the lungs and respiratory tracts, caused by legionella pneumophila. Legionnaires Disease is a form of pneumonia. The disease is in various gradations, from light to heavy or even fatal. The risk of death is 5 to 25 percent. The incubation period, the time between infection
Legionella is a bacteria, which is a member of the family Legionellaceae. Legionella acquired its name after an outbreak in the US in 1976. Then it was an unknown mystery disease which caused many sickened and deaths. In 1977 this bacteria was named legionella. Legionella bacteria The bacteria which causes the disease, is Legionella Pneumophila.
With the 3 requirements in place and slow moving / stagnant water, legionella colonies can grow very fast. 100 cfu/ltr can multiply to dangerous concentration of 10000 cfu/ltr and more with 48 hours.
Legionella growth need the 3 requirements (temperature, oxygen and food). But still there are places in the installation where legionella grow fast: Tanks, plastic pipework, spa’s / wellness, stagnant water, cooling towers and large/complicated drinking water installations. Legionella contamination can only occur by breathing in aerosols (shower, cooling towers or jacuzzi) or by choking water
Water temperature plays an important role for bacteria growth in general and legionella growth specially. There is no need to make an argument whether the water temperature within the UAE or GCC area is high. So most of the cold water temperatures are between 25-45 ºC and supports an ideal water temperature situation for legionella