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Volume 32, Number 8—August 2026

Epidemiologic, Entomologic, and Virologic Findings during Reemergence of Western Equine Encephalitis Virus, Argentina

Lorena Spinsanti¹, Cintia Fabbri¹, Ana Piskorz, Victoria Luppo, Gonzalo Castro, Adrián Farías, Mauricio Beranek, Gabriel Barco, Mariel Feroci, Cintia Barulli, Jorge García, Anabel Sinchi, Anabella Fantilli, María Belén Pisano, Agostina Pierdomenico, Andrea Marcos, Rodrigo Balzano, Facundo Cuba, Sol Haim, Florencia Mallou, Carolina Paladino, Tomás Poklepovich, Liliana Luque, Brenda Konigheim, Juan Javier Aguilar, Jimena Renga, Maria Alejandra Morales², and Adrián Díaz²

Author affiliation: National University of Córdoba, Córdoba, Argentina (L. Spinsanti, G. Castro, A. Farías, M. Beranek, G. Barco, A. Fantilli, M.B. Pisano, B. Konigheim, J.J. Aguilar, A. Díaz); National Administration of Laboratories and Health Institutes, Buenos Aires, Argentina (C. Fabbri, V. Luppo, M. Feroci, C. Barulli, J. García, A. Sinchi, F. Cuba, S. Haim, F. Mallou, C. Paladino, T. Poklepovich, M.A. Morales); National Service of Agrifood Health and Quality (SENASA), Buenos Aires (A. Piskorz, A. Pierdomenico, A. Marcos, R. Balzano, J. Renga); Ministry of Health of Córdoba Province, Córdoba (G. Castro, L. Luque); National Scientific and Technical Research Council (CONICET), Buenos Aires (G. Barco, M.B. Pisano, B. Konigheim, A. Diaz)

Main Article

Virologic and epidemiologic characteristics of equine cases in study of reemergence of western equine encephalitis virus, Argentina, 2023–2024*

Case ID	Species	Province	Location	Isolate	Viral titer, PFU/mL	GenBank accession no.†
20854_50019	Ovine	Buenos Aires	Baradero	ND	ND	PV256238
E/5193/23_18433	Equine	Buenos Aires	Capilla del Señor	ND	ND	PV256244
20788_18438	Equine	Buenos Aires	General Lavalle	ND	ND	PV256235
20793_18437	Equine	Buenos Aires	General Madariaga	ND	ND	PV256237
21251	Equine	Catamarca	Recreo	ND	ND	PV126002
20337	Equine	Chaco	Fray Justo Santa María de Oro	ND	ND	PV126010
20297	Equine	Córdoba	San Francisco	ND	ND	PV126004
20257	Equine	Corrientes	Esquina	Positive	1.3 × 10⁶	PV126003 PV391940
E5191_23_18432	Equine	Corrientes	Lavalle	Positive	1.8 × 10⁷	PV256243 PV388336
20333	Equine	Formosa	Pirane	ND	ND	PV126005
20813	Equine	La Pampa	Quemú Quemú	ND	ND	ND
21264_50024	Equine	La Rioja	General Ocampo	ND	ND	PV256240
21263	Equine	La Rioja	General San Martín	ND	ND	ND
21265_50025	Equine	La Rioja	Rosario Vera Peñaloza	ND	ND	PV256241
21312_50030	Equine	Neuquén	Senillosa	ND	ND	PV256242
20789_18435	Equine	Rio Negro	Adolfo Alsina	Positive	2.2 × 10⁷	PV256236 PV388337
20841	Equine	Salta	Rosario de la Frontera	ND	ND	PV126007
21247_50022	Equine	San Luis	General Pedernera	ND	ND	PV256239
1242–1	Equine	Santa Fe	San Cristóbal	ND	ND	PV126008
1241–4	Equine	Santa Fe	San Cristóbal	ND	ND	PV126009
1242–7	Equine	Santa Fe	San Cristóbal	ND	ND	ND
1246	Equine	Santa Fe	San Cristóbal	ND	ND	ND
20621	Equine	Santiago del Estero	Bandera	ND	ND	PV126006

*ID, identification; ND, not determined. †Corresponds to those generated in this study.

Main Article

¹These authors contributed equally to this article.

²These senior authors contributed equally to this article.

Page created: June 25, 2026

Page updated: July 16, 2026

Page reviewed: July 16, 2026

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