antigenic and biologic characteristics of venezuelan encephalitis virus strains including a possible new subtype, isolated from the amazon region of peru in 1971. | nine strains of venezuelan encephalitis (ve) virus isolated from the amazon region of peru in 1971 were identified as antigenic subtype i based on plaque-reduction neutralization tests with four and 20 units of antibody. a tenth strain, 71d1252, was possibly a new subtype, but was related to subtypes i and iii. hemagglutinins of each strain made from infected mouse brains had optimals phs of 6.2 and 6.4. nine strains were pathogenic for adult hamsters and adult mice, but strain 71d1252 inapparen ... | 1975 | 235839 |