Serologic surveys for antibodies to Western, Eastern, California, and St. Louis Encephalitis and Dengue 3 arboviruses in Middle America, 1961-1975

A survey of sera and plasmas collected during 1961-1975 has shown that many geofile and animals of Middle America are suscefltible to infection by dengue 3 virus and the viruses of eastern, western, St. Louis, and California encephalitis. @read of any of these arboviruses in Middle America could cause serious efiidemics, since vaccines are not currently available fo7 these virus infections and mosquito vector control efforts are not always successful.