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Volume 7, Number 7—June 2001


Waterborne Outbreak of Tularemia Associated with Crayfish Fishing

Pedro Anda*Comments to Author , Javier Segura del Pozo*†, José María Díaz García‡, Raquel Escudero*, F. Javier García Peña§, M. Carmen López Velasco‡, Ricela E. Sellek*, M. Rosario Jiménez Chillarón‡, Luisa P. Sánchez Serrano*, and J. Fernando Martínez Navarro*
Author affiliations: *Instituto de Salud Carlos III, Majadahonda, Madrid, Spain; †Public Health Department, Alcalá de Henares, Madrid, Spain; ‡Cuenca Public Health Department, Cuenca, Spain; §Ministry of Agriculture and Fisheries, Algete, Madrid, Spain

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Table 4

Results of case-control study of tularemia in crayfish

Risk factors considered Prevalence of exposurea
in Cases Controls Crude ORb 95% CI Adjusted OR 95% CI
Injury on handling crayfish 17/18 6/20 39.7 4.3-369.7
Injury on catching c crayfish 8/17 3/20 5.0 1.1-23.8 29.1d 2.6-330.9
Injury on cleaning crayfish 10/17 3/20 8.1 1.7-38.6 38.8e 3.5-427.6
Not washing crayfish before cleaning 5/12 4/17 2.3 0.4-15.7
Washing crayfish by soaking 9/12 10/17 2.1 0.4-10.7
Washing hands with soap after cleaning 5/11 11/15 0.3 0.06-1.6

aDenominator indicates number of persons who answered each question.
bOR = odds ratio; 95% CI = 95% confidence interval.
cInjury on catching = injury while fishing or emptying net.
dAdjusted for cleaning-related injury.
eAdjusted for catching-related injury.

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