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Volume 8, Number 1—January 2002

A Large Outbreak of Legionnaires’ Disease at a Flower Show, the Netherlands, 1999

Jeroen W. Den Boer*†Comments to Author , Ed P.F. Yzerman‡, Joop Schellekens*, Kamilla D. Lettinga§, Hendriek C. Boshuizen*, Jim E. Van Steenbergen¶, Arnold Bosman*, Susan Van den Hof*, Hans A. Van Vliet*, Marcel F. Peeters#, Ruud J. Van Ketel§, Peter Speelman§, Jacob L. Kool*, and Marina A.E. Conyn Van Spaendonck*
Author affiliations: *National Institute of Public Health and the Environment, Bilthoven, the Netherlands; †Municipal Health Service Zuid-Kennemerland, Haarlem, the Netherlands; ‡Regional Laboratory of Public Health Haarlem, Haarlem, the Netherlands; §Academic Medical Center, Amsterdam, the Netherlands; ¶National Outbreak Structure for Infectious Diseases, Den Haag, the Netherlands; #Regional Laboratory of Public Health Tilburg, Tilburg, the Netherlands

Main Article

Table 3

Logistic regression model of data from questionnaires and drawings comparing host factors and visits to specific sites at the exhibition for cases and controls

Study population Respondents to questionnaire and set of drawings; ORa (95% CI)(101 cases, 119 controls)
Age 1.1 (1.0 - 1.1)
Male sex 2.1 (1.0 - 4.5)
Smoking 6.0 (2.4 - 15.1)
Total hours at exhibition 2.2 (1.5 - 3.2)
Hours at consumer exhibition 0.5 (0.3 - 0.8)
Pausing at whirlpool spa in hall 3b 2.6 (1.1 - 6.6)
Pausing at bubblemat in hall 3b 3.0 (1.1 - 8.0)
Pausing in gangway of bubblemat in hall 3b 0.3 (0.1 - 0.8)

aOR = odds ratio; CI = 95% confidence interval.
bSee Figure 3a.

Main Article

1A bubblemat is an inflatable rubber mat that causes a whirlpool-like effect when placed in a normal bathtub.

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