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Posted By Jim Walker
Can anyone quote temperature parameters between which I can reasonably expect the presence of Legionella. References to sources would be useful too.
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Posted By Bill Elliott
Growth of the bacteria can reasonably be expected over the temperature range 20-45 degrees C. Below 20 there is no proliferation of the organism and above 60, it does not survive. The organism may lie dormant and only grow when the water reaches a suitable temperature (Health & Safety: Hazardous Agents - Dr Chris Hartley pp 167-168, published IOSH Services)
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Posted By Jim Walker
Thanks Bill,
Exactly what I needed within 5 minutes of writing the request.
This forum is the ..............(better not say or the Beardies will be after me.)
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Posted By garyh
You need the HSE publication L8 "Legionaires disease - the control of legionella bacteria in cooling water systems ACOP".
If you have any concerns re Legionella then really you must have this doc which is very useful.
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Posted By Jim Walker
Gary,
I guessed someone would say that.
I do have this, plus a mountain of Legionella info.
Unfortunately its 600 miles away and I needed a quick answer.
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Posted By garyh
You did ask for source reference hence I quoted it! I was taught that the temp range to worry about was 20-60oC. Above and below you should be OK.
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Posted By Jim Walker
Gary,
Sorry, in written form, my reply appeared a bit rude.
Imagine I said it with a big daft grin on my face.
Maybe we need some emoticons (or whatever they are called) on the replies.
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Posted By garyh
No probs mate.
Hey it's good to find someone on the forum with manners - many posts are rather terse and can be rude. I admit I have done it myself.
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Posted By Adrian Watson
At low temperature (20°C), only limited growth of legionellae occurs, but at 35°C they rapidly multiply intracellularly. The effectiveness of increasing the water temperature to 50 to 70°C has been challenged since L. pneumophila has been isolated in two domestic hot water systems that delivered water at temperatures of >50°C, and in one instance, at 70°C. One possible explanation for this finding is that the temperature is not homogenous throughout the system.
C. M. Anand et al., J. Hyg. (Lond). 91, 167–78 (1983).
T. J. Rowbotham, “Legionellae and Amoebae.” Legionella, Proceedings of the 2nd International Symposium, Washington, DC, 1984, pp. 325–327.
S. Cameron et al., Aust. N. Z. J. Med. 21, 65–70 (1991).
J. S. Colbourne et al., Lancet 1, 210–213 (1984).
Adapted from patty's industrtrial hygiene. 5th Edn 2005.
Redgards Adrian Watson
Regards Adrian Watson
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