Introduction: The surveillance blind spot in dengue diagnostics Dengue viruses are routinely monitored through molecular serotyping assays that identify circulating serotypes in patient samples. Recent work by Suppiah and colleagues highlights a significant blind spot: sylvatic dengue virus type 2 (DENV-2) strains are increasingly misclassified as “Undetermined Serotype” when using common commercial RT-qPCR serotyping assays.…