Prion, Viral, Bacterial and Fungal Pathogens of Humans [VV210]; Prion, Viral, Bacterial and Fungal Pathogens of Animals [LL821]; Pathogens, Parasites and Infectious Diseases (Wild Animals) [YY700]; Biological Resources (Animal) [PP710]; Pollution and Degradation [PP600]; Animal Immunology [LL650]; Host Resistance and Immunity [HH600]; Diagnosis of Animal Diseases [LL886]; origin; coronavirus disease 2019; human diseases; human activity; habitat destruction; habitat degradation; young animals; orphans; acquired immune deficiency syndrome; wild animals; wildlife conservation; disease transmission; animal diseases; zoonoses; disease prevention; disease control; vaccine development; viral diseases; infections; Severe acute respiratory syndrome coronavirus 2; man; Pongidae; Ebolavirus; Chlorocebus pygerythrus; squirrels; Severe acute respiratory syndrome-related coronavirus; Betacoronavirus; Coronavirinae; Coronaviridae; Nidovirales; positive-sense ssRNA Viruses; ssRNA Viruses; RNA Viruses; viruses; Homo; Hominidae; primates; mammals; vertebrates; Chordata; animals; eukaryotes; Filoviridae; Mononegavirales; negative-sense ssRNA Viruses; Chlorocebus; Cercopithecidae; Sciuridae; rodents; SARS-CoV-2; habitat loss; AIDS; zoonotic infections; viral infections