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Emerg Infect Dis. 2002 Jan;8(1):37-43.

A large outbreak of Legionnaires' disease at a flower show, the Netherlands, 1999.

Author information

1
National Institute of Public Health and the Environment, Bilthoven, the Netherlands. jwdenboer.ggdhaarlem@wxs.nl

Erratum in

  • Emerg Infect Dis 2002 Feb;8(2):180.

Abstract

In 1999, an outbreak of Legionnaires' disease affected many visitors to a flower show in the Netherlands. To identify the source of the outbreak, we performed an environmental investigation, as well as a case-control study among visitors and a serologic cohort study among exhibitors to measure exposure to possible sources. Of 77,061 visitors, 188 became ill (133 confirmed and 55 probable cases), for an attack rate of 0.23% for visitors and 0.61% for exhibitors. Two whirlpool spas in halls 3 and 4 of the exhibition and a sprinkler in hall 8 were culture positive for Legionella pneumophila. One of three genotypes found in both whirlpool spas was identical to the isolates from 28 of 29 culture-positive patients. Persons who paused at the whirlpool spa in hall 3 were at increased risk for becoming ill. This study illustrates that whirlpool spas may be an important health hazard if disinfection fails.

PMID:
11749746
PMCID:
PMC2730281
[Indexed for MEDLINE]
Free PMC Article

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