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Volume 18, Number 1—January 2012

Dispatch

Dengue Outbreak in Key West, Florida, USA, 2009

Elizabeth G. Radke, Christopher J. Gregory, Kristina W. Kintziger, Erin K. Sauber-Schatz, Elizabeth A. Hunsperger, Glen R. Gallagher, Jean M. Barber, Brad J. Biggerstaff, Danielle R. Stanek, Kay M. Tomashek, and Carina G.M. BlackmoreComments to Author 
Author affiliations: Florida Department of Health, Tallahassee, Florida, USA (E.G. Radke, K.W. Kintziger, E.K. Sauber-Schatz, D.R. Stanek, C.G.M. Blackmore); Centers for Disease Control and Prevention, San Juan, Puerto Rico (C.J. Gregory, E.A. Hunsperger, G.R. Gallagher, K.M. Tomashek); Centers for Disease Control and Prevention, Atlanta, Georgia, USA (E.K. Sauber-Schatz); Monroe County Health Department, Key West, Florida, USA (J.M. Barber); Centers for Disease Control and Prevention, Fort Collins, CO, USA (B.J. Biggerstaff)

Main Article

Table

Risk factors associated with laboratory-positive dengue virus infection among residents of Key West, Florida, USA, according to household survey, September 2009*

Variable No. (%)† persons with infection, n = 13 No. (%) persons without recent infection, n = 227 Crude OR (90% CI)‡
Bird bath in yard 5 (41) 26 (11) 5.6 (1.5–21.3)
Windows open >50% of the time 5 (41) 37 (15) 3.9 (1.1–14.0)
Vegetation covers >50% of yard 8 (59) 61 (30) 3.4 (1.0–11.2)
Outside in evenings 11 (86) 149 (67) 3.1 (1.0–9.5)
Bitten by mosquito at work/school 5 (32) 28 (14) 3.0 (1.1–8.2)
Uses repellent containing DEET 3 (20) 98 (41) 0.4 (0.1– 0.9)
Uses mosquito bite prevention measures 4 (26) 119 (52) 0.3 (0.1–0.7)
Air conditioning on >50% of time 6 (37) 170 (75) 0.2 (0.1– 0.6)
Traveled outside Florida in past 3 mo 2 (12) 93 (38) 0.2 (0.1–0.9)
Empties water from containers regularly 1 (6) 79 (36) 0.1 (0.0–0.7)

*OR, odds ratio; DEET, N,N-diethyl-m-toluamide.
†Weighted percentages are reported, reflecting the stratified, 1-stage cluster sampling design. Responses were weighted to account for the different probabilities of household inclusion across strata, within-household participation rates, and interhousehold clustering of infections.
‡Significance level, p = 0.10. Weighted logistic regression models were used to assess risk factors for recent infection, and CIs were based on the modeling accounted for the sampling design.

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