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Volume 14, Number 5—May 2008

Dispatch

Increase in West Nile Neuroinvasive Disease after Hurricane Katrina

Kevin A. Caillouët*Comments to Author , Sarah R. Michaels*, Xu Xiong*, Ivo Foppa*, and Dawn M. Wesson*
Author affiliations: *Tulane University School of Public Health and Tropical Medicine, New Orleans, Louisiana, USA;

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Table 2

Incidence rate ratios of West Nile neuroinvasive disease (WNND) in 2002–2005 and 2006 in Louisiana parishes and Mississippi counties*

State, area West Nile neuroinvasive disease incidence rate†
Incidence rate ratio (95% CI)
2002‡ 2003‡ 2004‡ 2005‡ 2002–2005§ 2006¶
Louisiana
Affected 5.6 1.3 0.2 1.4 2.1 4.4 2.09 (1.48–2.94)
Unaffected
4.1
2.7
2.7
3.2
3.2
1.5
0.47 (0.35–0.64)
Mississippi
Affected 6.1 2.1 0.8 1.5 2.6 6.5 2.45 (1.77–3.47)
Unaffected 5.5 1.7 1.2 1.3 2.4 1.7 0.71 (0.55–1.03)

*WNND incidence rates increased 2-fold in the hurricane-affected regions of both states. The unaffected regions showed a decrease in WNND incidence rates (Louisiana) and no change in incidence (Mississippi). CI, confidence interval.
†No. cases/100,000.
‡Population estimate based on 2000 US Census (8).
§Cumulative WNND incidence = (no. WNND cases 2002 + 2003 + 2004 + 2005) / cumulative population (Census 2000 [8] × 100,000).
¶Population estimate based on 2006 US Census estimate (7).

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