Reemergence of DENV-3III_C.1 and emergence of DENV-3III_B.3.2 in Ecuador: multiple introductions and dispersal patterns, 2022-2026.

Authors

Sully Márquez, Lizeth Salazar, Gabriela Echeverría-Garcés, Diana Gutiérrez-Pallo, Gabriel Trueba, Joseph N S Eisenberg, Josefina Coloma, Andrés Carrazco-Montalvo

Published in

International journal of infectious diseases : IJID : official publication of the International Society for Infectious Diseases. Pages 109189. Oct 17, 2026. Epub Oct 17, 2026.

Abstract

We characterized the reemergence of DENV-3III_C.1, the emergence of DENV-3III_B.3.2, and their phylogeographic spread in Ecuador during 2022-2026 through integrated epidemiologic and genomic surveillance. Lineage DENV-3III_C.1 formed a monophyletic Ecuadorian cluster closely related to Colombian viruses. The earliest sampled Ecuadorian sequence was detected in Esmeraldas, compatible with a possible introduction across the northern border followed by within-country dissemination. Lineage DENV-3III_B.3.2 comprised multiple Ecuadorian clades related to viruses from Colombia, Cuba, and the United States (travel-associated), consistent with independent introductions followed by geographic expansion. These findings reveal distinct transmission histories and support strengthened genomic surveillance at border crossings and other key points of entry.

PMID:
42892551
Bibliographic data and abstract were imported from PubMed on 18 Oct 2026.

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