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Flavivirus Type-Specific Antigens Produced from Fusions of a Portion of the E Protein Gene with the Escherichia coli trpe Gene

Based on previous data showing that JEV and DEN-1 fusion proteins can be used as antigens, we engineered analogous fusion proteins for the same regions of the E proteins of DEN-2, DEN-3, and DEN-4, using the polymerase chain reaction. The resulting fusion proteins were tested in a modified ELISA for their reactivity with mouse immune ascitic fluids (MIAF) generated against 10 different flaviviruses. The results showed that these recombinant antigens could be used as type-specific immunological reagents, and suggest that these antigens could serve as the basis for rapid, safe, and inexpensive flavivirus serosurveys.