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Volume 32, Number 8—August 2026

Research

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

Table 1

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 27, 2026
Page reviewed: July 27, 2026
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