Estimating the velocity and direction of African Swine Fever spread in wild boar populations in South Korea using Trend-Surface Analysis
PLoS ONE publish this investigation article
April 2nd, 2026
African swine fever (ASF) is a lethal disease of swine that has spread across Asia since its introduction in 2018. South Korea first reported the disease in September 2019 in domestic pigs, and since then, more than 4,000 cases have been reported in wild boars during its expansion up to August 2024. Due to the high number of ASF notifications in wild boars in South Korea, contrasted with their scarcity in most Asian countries, analyzing the spatiotemporal spread of the disease in a setting with active surveillance provides valuable insights. In this study, we performed a trend-surface analysis on temporally gridded case data to characterize the overall geographic spread and direction of ASF in wild boars across South Korea, from its emergence to August 2022. Additionally, we propose a novel approach distinct from previous studies, to estimate spread velocity by incorporating an upper threshold to avoid unrealistic values. The model described the spread of ASF in the study area. The disease showed greater expansion in the east of the country. Initially, a south and eastward direction was estimated. The estimated median velocity was 19.53 km/month, with cell-level velocities ranging from 2.45 to 69.99 km/month. Velocity increased notably from autumn 2021 onward and varied substantially across years. Our results show the dynamics of ASF in wild boars of South Korea, providing new evidence of their role in the epidemiology of the disease
Aguilar-Vega C., Bosch J., Ito S., Ivorra B., Jeong H. and Sanchez-Vizcaino JM.
 | Servicio de Inmunología Viral y Medicina Preventiva (SUAT). Centro de Vigilancia Sanitaria Veterinaria (VISAVET). Universidad Complutense (UCM). |
| Departamento de Sanidad Animal. Facultad de Veterinaria. Universidad Complutense (UCM). |
 | Centre de Recerca en Sanitat Animal (CReSA). Universitat Autònoma de Barcelona (UAB). Instituto de Investigación y Tecnología Agroalimentarias (IRTA). Generalitat de Catalunya. |
| Centre de Recerca en Sanitat Animal (CReSA). Universitat Autònoma de Barcelona (UAB). Instituto de Investigación y Tecnología Agroalimentarias (IRTA). Generalitat de Catalunya. |
 | South Kyushu Livestock Veterinary Center. Kagoshima University. |
| Interdisciplinary Mathematics Institute (IMI). Facultad de Ciencias Matemáticas. Universidad Complutense (UCM). |
| Dodram Pig Research Center. | |
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