Role of Wild Boar in the Spread of Classical Swine Fever in Japan
Investigation article published in Pathogens
October 24th, 2019
Since September 2018, nearly 900 notifications of classical swine fever (CSF) have been reported in Gifu Prefecture (Japan) affecting domestic pig and wild boar by the end of August 2019. To determine the epidemiological characteristics of its spread, a spatio-temporal analysis was performed using actual field data on the current epidemic. The spatial study, based on standard deviational ellipses of official CSF notifications, showed that the disease likely spread to the northeast part of the prefecture. A maximum significant spatial association estimated between CSF notifications was 23 km by the multi-distance spatial cluster analysis. A space-time permutation analysis identified two significant clusters with an approximate radius of 12 and 20 km and 124 and 98 days of duration, respectively. When the area of the identified clusters was overlaid on a map of habitat quality, approximately 82% and 75% of CSF notifications, respectively, were found in areas with potential contact between pigs and wild boar. The obtained results provide information on the current CSF epidemic, which is mainly driven by wild boar cases with sporadic outbreaks on domestic pig farms. These findings will help implement control measures in Gifu Prefecture
Ito S., Jurado C., Bosch J., Ito M., Sanchez-Vizcaino JM., Isoda N. and Sakoda AY.
 | Research Center for Zoonosis Control. University Hokkaido. |
 | 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). |
| Akabane Animal Clinic. | |
| Global Station for Zoonosis Control. Global Institute for Collaborative Research and Education (GI-CoRE). University Hokkaido. |
| Department of Disease Control, Laboratory of Microbiology. Faculty of Veterinary Medicine. University Hokkaido. |
