Yunhee Gim

1. Introduction Coronaviruses (CoVs) constitute a highly diverse group of enveloped single-stranded, positive-sense RNA viruses, primarily responsible for causing significant respiratory and enteric diseases in humans and diverse companion, domestic, and wild animals, posing a socioeconomic threat to both humans and animals [1–4]. Characterized by the largest RNA genome (~25–32 kb), CoVs belong to the subfamily Orthocoronavirinae within the family Coronaviridae of the order Nidovirales [5, 6].

Conflicts of Interest The authors declare that they have no conflict of interest. References 1 , , , , , and , Pathogenicity of 2 porcine deltacoronavirus strains in gnotobiotic pigs, Emerging Infectious Diseases. (2015) 21, no. 4, 650–654, https://doi.org/10.3201/eid2104.141859, 2-s2.0-84925012695.