The Korean Type 2 field viruses (n = 247) isolated in 2013–2016 were classified into five different lineages: lineage 1 (n = 9), lineage 5 (n = 83), lineage kor A (n = 33), lineage kor B (n = 72), and lineage kor C (n = 50) (Fig. 2b), with infection prevalence rates of 1.66% (9/542), 15.3% (83/542), 6.08% (33/542), 13.2% (72/542), and 9.22% (50/542) among ORF5-positive farms, respectively. Here, CWC15 is linked to infection.