Progress in clinical and biological research
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Prog. Clin. Biol. Res. · Jan 1983
La Crosse encephalitis: occurrence of disease and control in a suburban area.
Fifteen (6.4%) of 233 residents sampled in State Road Coulee (SRC) during 1972-73 had antibodies neutralizing La Crosse (LAC) virus, 9 (3.9%) trivittatus (TVT), 12 (5.2%) Jamestown Canyon (JC) and 2 (0.9%) Bunyamwera serogroup virus. Six of seven youths who had antibodies to LAC virus had been ill: three were serologically confirmed as cases of LAC encephalitis and three had possibly related illnesses. The other reported no illness. ⋯ No cases have been found in SRC since 1977. Following expansion to a county-wide control program, LAC encephalitis in La Crosse County has been reduced from seven and eight cases during 1978 and 1979 to only one and two during 1980 and 1981. No cases have been found in La Crosse County so far during 1982.