Cooling-water systems have been the source of outbreaks of Legionnaires’ disease, and the causative organism Legionella pneumophila has been identified in 44% of such systems. Re-circulating cooling water systems require regular maintenance and treatment.  Recommendations to reduce the risk of outbreaks of the disease arising from this source have been issued by the Department of Health and Social Security (DHSS). Chlorine has been reported as ineffective, especially in the presence of organic matter or at pH 8 or higher. (Department of Virology, John Radcliffe Hospital, Oxford, U.K.)

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