A historical cross-border Andes virus lineage reveals the origin of a cruise ship hantavirus pulmonary syndrome outbreak
Ramos, H.; Diaz-Gavidia, C.; Diaz-Ramirez, D.; Fuentes-Luppichini, E.; Kuhn, J. H.; Bellomo, C. M.; Schüller, A.; Araya-Secchi, R.; International Genomics Consortium Investigating the M/V Hondius Outbreak, ; Cisterna, D. M.; Fernandez-Bettelli, L.; Palacios-Aliggi, S.; Martinez, V. P.; Ferres, M.; Maes, P.; Palacios, G.; Tischler, N. D.; Angulo, J.
Show abstract
Andes virus (ANDV) caused a multi-country outbreak of hantavirus pulmonary syndrome among passengers and crew of a cruise ship in 2026. To investigate the origin and evolutionary history of the virus responsible for the outbreak, we analyzed complete ANDV small (S), medium (M), and large (L) genome segment sequences from Chile alongside outbreak-associated and publicly available genome sequences. Across all three segment-specific phylogenies, the outbreak virus clustered within an ANDV Clade III cluster spanning southern Chile and northern Patagonia in Argentina and were most closely related to a human-derived ANDV (p1236) collected in Los Rios Region of Chile in 2012, representing the closest known historical relative of the outbreak-associated virus. Phylogeographic analysis showed that the genetically distinct ANDV Clade V lineage circulating in central Chile was not closely related to the cruise ship outbreak-associated genomes, thereby reducing the likelihood that the index cases acquired infection through zoonotic spillover while traveling through the Maule Region. These findings trace the geographic origin of the outbreak-associated virus to a defined corridor, the Hua Hum Pass, a cross-border zone connecting Neuquen Province in Argentina with the Los Rios and La Araucania Regions of Chile.
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