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ISSN : 2287-7991(Print)
ISSN : 2287-8009(Online)
Journal of the Preventive Veterinary Medicine Vol.44 No.3 pp.136-139

Seroprevalence of the swine influenza A virus in domestic pigs in the Republic of Korea

In-Ohk Ouh1,2#,Seo Young Moon1#,Mi-Ja Park1,Min Ji Kim1,Min-Ho Seong3,Jong-Sik Bak3,Hyoung seok Yang4,Hyeonhae Choi1,Suyeong Yun1,Bang-hun Hyun1,Soo dong Cho1,Yoon-Hee Lee1†,Choi-Kyu Park2†
1Viral Disease Division, Animal and Plant Quarantine Agency, Gimcheon 39660, Gyeongsangbuk-do, Republic of Korea
2College of Veterinary Medicine & Animal Disease Intervention Center, Kyungpook National University, Daegu 41566, Republic of Korea
3Gyeongnam Veterinary Service Laboratory, Jinju 52733, Gyeongsangnam-do, Republic of Korea
4Veterinary Research Institute, Jeju 63344, Jeju Special Self-Governing Province, Republic of Korea
# These authors equally contributed.
Corresponding Authors. Yoon-Hee Lee, Tel: +82-54-912-0801, Fax: +82-54-912-0812, E-mail: Choi-Kyu Park, Tel: +82-53-950-5973, Fax: +82-53-950-5955, E-mail:


Influenza A virus (IAV) causes respiratory disease in birds and mammals, including pigs and humans. Infection by IAV in pigs increases not only economic losses in the swine industry but also the emergence of novel IAV variants via gene reassortment, which is important due to the susceptibility of both birds and humans to IAV. This study provides serological data obtained during a study to detect IAV infections in pigs in the Republic of Korea during 2018 and 2019. A total of 1,559 samples were collected from 74 domestic pig farms. Hemagglutination inhibition (HI) assays were performed using the A/Swine/Korea/25-13(H1N1), A/Swine/Korea/E102 (H1N2), and A/Swine/Korea/Cy10/2007 (H3N2) viruses as antigens. The HI assay results showed that 266 of the 1,559 samples were seropositive (17.0%). Among these, H1N1, H1N2, and H3N2 comprised 7.3% (114), 6.0% (93), and 8.8% (137) of the 1,559 samples, respectively. Co-infections of H1N1/H1N2, H1N1/H3N2, H1N2/H3N2 and H1N1/H1N2/H3N2 were observed in 2.1% (31), 1.5% (23), 1.5% (24), and 0.8% (13) of the 1,559 samples, respectively. Interestingly, IAV infections were detected in all nine provinces of the country.