V. Evaluation of Cross-Immunity against Type 1 Dengue Fever in Human Subjects Convalescent from Subclinical Natural Japanese Encephalitis Virus Infection and Vaccinated with 17D Strain Yellow Fever Vaccine
A method for producing large volumes of mouse ascitic fluids with high viral antibody titers by the use of adjuvant in combination with Sarcoma 180 cells is described. Ascitic fluids so produced reacted specifically with the viruses to which they were prepared. In cross complement-fixation and hemagglutination-inhibition tests, none of 26 ascitic fluids prepared to individual viruses and of nine polyvalent ascitic fluids reacted with antigens outside the recognized or artificial grouping. Satisfactory neutralization indices were obtained with the ascitic fluids tested.