Table 2.
Phylogenetic, pathogenetic characteristics of SARS-CoV-2, SARS-CoV and MERS-CoV.
| Phylogenetic origin | Genome sequence homology to SARS-CoV-2 | Animal reservoir | Intermediate host | Receptor | Disease | Route of transmission | References | |
|---|---|---|---|---|---|---|---|---|
| SARS-CoV-2 | Clade I, cluster IIa | – | Bats | Pangolin? | ACE2 | COVID-19 | Droplets, Contact | 32075786 |
| SARS-CoV | Clade I, cluster IIb | 82% | Bats | Palm civets | ACE2 | SARS | Droplets, Contact | 12711465 |
| MERS-CoV | Clade II | 50% | Bats | Camels | DPP4 | MERS | Contact | 29680581 |
COVID-19, 2019 novel coronavirus disease; ACE2, Angiotensin-converting enzyme 2; DPP4, Dipeptidyl peptidase 4; MERS, Middle East Respiratory Syndrome; MERS-CoV, Middle East Respiratory Syndrome Coronavirus; SARS, Severe Acute Respiratory Syndrome; SARS-CoV, Severe Acute Respiratory Syndrome Coronavirus; SARS-CoV-2, Severe Acute Respiratory Syndrome Coronavirus 2.