Severe acute respiratory syndrome-coronavirus (SARS-CoV-2, or COVID-19 virus) is a worldwide pandemic
pathogen infecting 210 territories. It belongs to the family coronaviriadae and the order Nidovirales. The SARS-CoV-2
virus is a positive-sense single-stranded RNA enveloped virus that includes spike proteins projecting from the envelope.
The spike (S) protein interacts with the human angiotensin-converting enzyme 2 (ACE2) receptor, which plays a role in
the viral entry into the cell. The SARS-CoV-2 virus is zoonotic, the wet animal market where live animals are sold is
expected to be the source of infection. It is the third zoonotic coronavirus, after SARS-CoV and MERS-CoV.
Transmission of the virus among humans is confirmed by direct contact, droplet infection, fecal-oral, and blood
transmission. The symptoms of COVID 19 include fever, dry cough, headache, and difficulty of breathing. COVID 19
complications, including the development of acute respiratory distress syndrome (ARDS), acute organ injury, secondary
infection, and shock, are common in immunocompromised and elderly patients. Up till now, there is no established
treatment for COVID-19, and supportive measures including mechanical ventilation and the use of nonspecific anti-viral
therapies such as Remdesevir, Liponavir, and chloroquine are currently applied on the severe cases. Also, until now, there
is no approved vaccine for COVID-19. In the review, we gave an update on the SARS-COV2 virus, focusing on the
epidemiology, pathogenesis, clinical presentations, treatment options, and preventive measures associated with COVI-19