Volume 14, Number 5—May 2008
Dispatch
Increase in West Nile Neuroinvasive Disease after Hurricane Katrina
Table 1
West Nile neuroinvasive disease (WNND) before and after Hurricane Katrina for the 3 years before the storm (2002–2004), the year of the storm (2005), and the year after the storm (2006) in Louisiana parishes and Mississippi counties*
State | Affected areas |
Unaffected areas |
|||||||||
---|---|---|---|---|---|---|---|---|---|---|---|
CDC weeks 32–34† |
CDC weeks 35–37‡ |
CDC weeks 32–34† |
CDC weeks 35–37‡ |
||||||||
WNND cases | 95% CI | WNND cases | 95% CI | WNND cases | 95% CI | WNND cases | 95% CI | ||||
Louisiana | |||||||||||
2002 | 22 | 14.6–33.3 | 8 | 4.1–15.8 | 37 | 26.9–51.0 | 20 | 13.0–30.9 | |||
2003 | 2 | 0.6–7.2 | 3 | 1.09–8.8 | 18 | 11.4–28.5 | 16 | 9.9–26.0 | |||
2004 | 1 | 0.2–5.6 | 1 | 0.2–5.6 | 23 | 15.4–34.5 | 11 | 6.2–19.7 | |||
2005 | 0 | 0–3.0§ | 11 | 6.2–19.7§ | 28 | 19.4–40.5 | 12 | 6.9–21.0 | |||
2006 |
11 |
6.2–19.7 |
8 |
4.1–15.8 |
13 |
7.7–22.2 |
16 |
9.9–26.0 |
|||
Mississippi | |||||||||||
2002 | 13 | 7.7–22.2 | 12 | 6.9–21.0 | 38 | 27.7–52.2 | 21 | 13.8–32.1 | |||
2003 | 3 | 1.1–8.8 | 3 | 1.1–8.8 | 5 | 2.2–11.7 | 4 | 1.6–10.2 | |||
2004 | 1 | 0.2–5.6 | 2 | 0.6–7.2 | 12 | 6.9–21.0 | 4 | 1.6–10.2 | |||
2005 | 0 | 0–3.0§ | 10 | 5.5–18.4§ | 8 | 4.1–15.8 | 10 | 5.5–18.4 | |||
2006 | 12 | 6.9–21.0 | 9 | 4.8–17.1 | 14 | 8.4–23.5 | 9 | 4.8–17.1 |
*CDC, Centers for Disease Control and Prevention; CI, confidence interval (Poisson).
†3 weeks before landfall of hurricane.
‡3 weeks after landfall of hurricane.
§p<0.05.