Skip directly to search Skip directly to A to Z list Skip directly to page options Skip directly to site content

Volume 8, Number 1—January 2002

Research

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 2

Results of univariate analysis of data from questionnaires and drawings comparing host factors and visits with specific sites at the exhibition for cases and controls.

Study population Respondents' questionnaire and set of drawings; univariate ORa (95% CI) (101 cases, 119 controls) Respondents' questionnaire and set of drawings; raw data (101 cases, 119 controls)
Age 1.1 (1.0 - 1.1) na
Male 2.7 (1.6 - 4.7) 63/45
Underlying disease 7.2 (1.5 - 33.1) 11/2
Smoking 2.0 (1.1 - 3.6) 42/31
Total hours at exhibition 1.7 (1.4 - 2.1) 4/3
Hours at consumer exhibition 1.0 (0.8 - 1.3) 1/1
Pausing at whirlpool spa in hall 3 4.2 (1.9 - 9.0) 41/21
Pausing at bubblemat in hall 3 3.7 (1.6 - 8.2) 37/17
Pausing in gangway of bubblemat in hall 3 0.4 (0.2 - 1.0) 24/35
Pausing at electric kettle in hall 3 3.0 (1.3 - 7.0) 26/12
Pausing at whirlpool in hall 4 2.4 (1.1 - 5.4) 31/20
Pausing at steam iron in hall 4 5.4 (1.4 - 22.0) 16/3

aOR = odds ratio; CI = 95% confidence intervals; na = not available.

Main Article

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

TOP