Non-Imported Probable and Confirmed Cases and Incidence Risk^*of La Crosse Virus Infections in Children 15 Years and Younger Reported in the eastern United States, 2003–2007, by State.

*<p>Incidence risk was calculated in counties reporting probable and confirmed cases of La Crosse virus infections and presented as the number of cases per 100,000 persons in children 15 years and younger, and are expressed here as a range in those states with two or more counties reporting cases.</p>†<p>No incidence risk is reported for states not reporting cases 15 years and younger.</p

Non-Imported Probable and Confirmed Cases and Incidence Risk^* of La Crosse Virus Infections for Children 15 years and Younger in the eastern United States, 2003 to 2007, by Region.

*<p>Incidence risk was calculated by region and month using the both probable and confirmed cases of La Crosse virus infections and presented as the number of cases per 100,000 persons in children 15 years and younger.</p>··<p>Illinois, Iowa, Indiana, Michigan, Minnesota, Ohio, and Wisconsin.</p>†<p>Alabama, Georgia, Kentucky, Louisiana, Mississippi, North Carolina, South Carolina, Tennessee, Virginia, and West Virginia.</p

Maps of the study area.

<p>Map of Tennessee (a) showing the study area and (b) the distribution and names of the counties within the study area.</p

Variables considered in the census tract and cluster discriminant analyses.

<p>*Mean of the variables considered in the census tract analysis comparing those census tracts with one or more reported cases of La Crosse virus infection to those census tracts without any reported cases of La Crosse virus infection.</p>†<p>Mean of the variables considered in the cluster discriminant analysis comparing those census tracts of significantly high-risk to those of significantly low-risk for La Crosse virus infection.</p>1<p>HSD: High school diploma.</p>2<p>GED: General education diploma.</p>3<p>>HSD/GED: Includes some college, associate degree, bachelor degree, graduate degree or professional degree.</p

The unsmoothed incidence risk at the county level.

<p>These maps represent the distribution of unsmoothed risk of La Crosse virus infections at the county level for eastern Tennessee using three different population groups to calculate incidence risk: a) the total population, b) the population 18 years and younger, and c) the population 15 years and younger.</p

Comparisons of the Incidence Risk of La Crosse Virus Infections for At-Risk Population Groups at the County and Census Tract Levels in eastern Tennessee, 1997–2006.

*<p>Number of counties or census tracts used for each specific analysis.</p

Independent variables retained following the discriminant analysis comparing low-risk clusters for LACV infection to high-risk clusters for LACV infection and selected model parameters.

1<p>HSD: High school diploma.</p>2<p>GED: General education diploma.</p

Distribution of the cumulative incidence, cases, and clusters of reported La Crosse virus infections in West Virginia census tracts from 2003 to 2007.

<p>(A) Cumulative incidence of La Crosse virus infections, (B) Distribution of cases of La Crosse virus infection, and (C) Significantly high- and low-risk clusters for La Crosse virus infection.</p

The spatial clustering of La Crosse virus infections at the county and census tract levels.

<p>These maps show the significant clustering of La Crosse virus infections for the population 18 years and younger at the county level (a) and at the census tract level (b) detected by the Local Indicators of Spatial Autocorrelation (LISA) statistic for eastern Tennessee.</p

Independent variables retained following the discriminant analysis comparing census tracts with no reported cases of LACV infection to those census tracts with at least one reported case of LACV infection and selected model parameters.

1<p>HSD: High school diploma.</p>2<p>GED: General education diploma.</p