Prion, Viral, Bacterial and Fungal Pathogens of Humans [VV210]; Pets and Companion Animals [LL070]; Prion, Viral, Bacterial and Fungal Pathogens of Animals [LL821]; Genetics and Molecular Biology of Microorganisms [ZZ395]; Molecular Biology and Molecular Genetics [ZZ360]; Taxonomy and Evolution [ZZ380]; Animal Immunology [LL650]; Biochemistry and Physiology of Microorganisms [ZZ394]; classification; strains; human diseases; coronavirus disease 2019; viral diseases; pathogenicity; disease transmission; Severe acute respiratory syndrome coronavirus 2; man; dogs; cats; Feline coronavirus; Canine coronavirus; Betacoronavirus; Alphacoronavirus; Severe acute respiratory syndrome-related coronavirus; Coronavirinae; Coronaviridae; Nidovirales; positive-sense ssRNA Viruses; ssRNA Viruses; RNA Viruses; viruses; Homo; Hominidae; primates; mammals; vertebrates; Chordata; animals; eukaryotes; Canis; Canidae; Fissipeda; carnivores; Felis; Felidae; Alphacoronavirus 1; Sarbecoronavirus; SARS-CoV-2; viral infections