Origin

Covid-19 stands for coronavirus 19 because the first case of COVID-19 occurred.

This virus is a highly transmittable and pathogenic virus.

(SARS-CoV-2)

The first case of COVID-19 was found in Wuhan, China. Later on, the virus was spread around the world, the people who were working or studying there came back to their native place because of the deadly impact of the virus, just to protect themselves from that virus but unknowingly carried the virus with them and the random person who had contact with had also got infected with the virus and thus the chain formed and rapidly the number of victims of this dangerous virus was rapidly growing.

The intermediate source of origin and transfer to humans is not known, however, the rapid human to human transfer has been confirmed widely.

However, few broad-spectrum antiviral drugs have been evaluated against COVID-19 in clinical trials, resulted in clinical recovery. In the current review, we summarize and comparatively analyze the emergence and pathogenicity of COVID-19 infection and previous human coronaviruses severe acute respiratory syndrome coronavirus (SARS-CoV) and middle east respiratory syndrome coronavirus (MERS-CoV).

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