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Legionella longbeachae detected in an industrial cooling tower linked to a legionellosis outbreak, New Zealand, 2015; possible waterborne transmission?
Epidemiol Infect. 2017 08; 145(11):2382-2389.EI

Abstract

A legionellosis outbreak at an industrial site was investigated to identify and control the source. Cases were identified from disease notifications, workplace illness records, and from clinicians. Cases were interviewed for symptoms and risk factors and tested for legionellosis. Implicated environmental sources were sampled and tested for legionella. We identified six cases with Legionnaires' disease and seven with Pontiac fever; all had been exposed to aerosols from the cooling towers on the site. Nine cases had evidence of infection with either Legionella pneumophila serogroup (sg) 1 or Legionella longbeachae sg1; these organisms were also isolated from the cooling towers. There was 100% DNA sequence homology between cooling tower and clinical isolates of L. pneumophila sg1 using sequence-based typing analysis; no clinical L. longbeachae isolates were available to compare with environmental isolates. Routine monitoring of the towers prior to the outbreak failed to detect any legionella. Data from this outbreak indicate that L. pneumophila sg1 transmission occurred from the cooling towers; in addition, L. longbeachae transmission was suggested but remains unproven. L. longbeachae detection in cooling towers has not been previously reported in association with legionellosis outbreaks. Waterborne transmission should not be discounted in investigations for the source of L. longbeachae infection.

Authors+Show Affiliations

MidCentral Public Health Services, MidCentral District Health Board,Palmerston North,New Zealand.Institute of Environmental Science and Research Ltd,Porirua,New Zealand.MidCentral Public Health Services, MidCentral District Health Board,Palmerston North,New Zealand.MidCentral Public Health Services, MidCentral District Health Board,Palmerston North,New Zealand.MidCentral Public Health Services, MidCentral District Health Board,Palmerston North,New Zealand.MidCentral Public Health Services, MidCentral District Health Board,Palmerston North,New Zealand.

Pub Type(s)

Journal Article

Language

eng

PubMed ID

28625225

Citation

Thornley, C N., et al. "Legionella Longbeachae Detected in an Industrial Cooling Tower Linked to a Legionellosis Outbreak, New Zealand, 2015; Possible Waterborne Transmission?" Epidemiology and Infection, vol. 145, no. 11, 2017, pp. 2382-2389.
Thornley CN, Harte DJ, Weir RP, et al. Legionella longbeachae detected in an industrial cooling tower linked to a legionellosis outbreak, New Zealand, 2015; possible waterborne transmission? Epidemiol Infect. 2017;145(11):2382-2389.
Thornley, C. N., Harte, D. J., Weir, R. P., Allen, L. J., Knightbridge, K. J., & Wood, P. R. T. (2017). Legionella longbeachae detected in an industrial cooling tower linked to a legionellosis outbreak, New Zealand, 2015; possible waterborne transmission? Epidemiology and Infection, 145(11), 2382-2389. https://doi.org/10.1017/S0950268817001170
Thornley CN, et al. Legionella Longbeachae Detected in an Industrial Cooling Tower Linked to a Legionellosis Outbreak, New Zealand, 2015; Possible Waterborne Transmission. Epidemiol Infect. 2017;145(11):2382-2389. PubMed PMID: 28625225.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Legionella longbeachae detected in an industrial cooling tower linked to a legionellosis outbreak, New Zealand, 2015; possible waterborne transmission? AU - Thornley,C N, AU - Harte,D J, AU - Weir,R P, AU - Allen,L J, AU - Knightbridge,K J, AU - Wood,P R T, Y1 - 2017/06/19/ PY - 2017/6/20/pubmed PY - 2017/8/19/medline PY - 2017/6/20/entrez KW - Legionella longbeachae KW - Legionnaires' disease KW - legionella KW - occupation-related infections KW - outbreaks KW - water-borne infections SP - 2382 EP - 2389 JF - Epidemiology and infection JO - Epidemiol Infect VL - 145 IS - 11 N2 - A legionellosis outbreak at an industrial site was investigated to identify and control the source. Cases were identified from disease notifications, workplace illness records, and from clinicians. Cases were interviewed for symptoms and risk factors and tested for legionellosis. Implicated environmental sources were sampled and tested for legionella. We identified six cases with Legionnaires' disease and seven with Pontiac fever; all had been exposed to aerosols from the cooling towers on the site. Nine cases had evidence of infection with either Legionella pneumophila serogroup (sg) 1 or Legionella longbeachae sg1; these organisms were also isolated from the cooling towers. There was 100% DNA sequence homology between cooling tower and clinical isolates of L. pneumophila sg1 using sequence-based typing analysis; no clinical L. longbeachae isolates were available to compare with environmental isolates. Routine monitoring of the towers prior to the outbreak failed to detect any legionella. Data from this outbreak indicate that L. pneumophila sg1 transmission occurred from the cooling towers; in addition, L. longbeachae transmission was suggested but remains unproven. L. longbeachae detection in cooling towers has not been previously reported in association with legionellosis outbreaks. Waterborne transmission should not be discounted in investigations for the source of L. longbeachae infection. SN - 1469-4409 UR - https://www.unboundmedicine.com/medline/citation/28625225/Legionella_longbeachae_detected_in_an_industrial_cooling_tower_linked_to_a_legionellosis_outbreak_New_Zealand_2015 L2 - https://www.cambridge.org/core/product/identifier/S0950268817001170/type/journal_article DB - PRIME DP - Unbound Medicine ER -