Volume 21, Issue 1
  • ISSN: 0002-9637
  • E-ISSN: 1476-1645



Eight isolates of La Crosse virus were obtained from 182,437 mosquitoes (4,643 pools) processed during 4 years of a 5-year study. Of the 8 isolates, 5 were from 1,985 (70 pools), and 1 each was from 1,818 , 35,867 group, and 36,800 . Six of the isolates were from mosquitoes collected by aspiration, and the other two from and collected in carbon dioxide-baited cone traps. Seasonal distribution of the isolates was similar to that of cases of California encephalitis: 3 in July, 2 in August, and 3 in September. is common in hardwood deciduous forests where in small wild mammals antibodies to the virus are prevalent and where children hospitalized with the disease have been exposed to the virus in nature.


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