Overview: An emerging blind spot in dengue diagnostics Recent correspondence highlights a critical flaw in routine dengue molecular surveillance: sylvatic dengue virus 2 (DENV-2) infections are being misclassified as “Undetermined Serotype” by commercial serotyping assays. This misclassification mirrors prior reports of assay failure against sylvatic DENV-2 strains, notably in Senegal, West Africa, suggesting a broader,…