ABSTRACT
In late December, 2019, a novel coronavirus was first reported in Wuhan, named as SARS-CoV-2 caused a series of acute atypical respiratory diseases. To date, virus has infected >9 million people and almost 630,193 death that is estimated about 6% it mainly transmitted through contaminated respiratory droplets between people. So far, many hypotheses have been put forward about how the virus originated but here on theory about the origin of the virus as a result of mutation and natural selection will be discussed. Right now there is not enough information to make sure that weather recovery from COVID-19 is safe or immunity does provide long-term protection against COVID-19. The persistence of the virus has been investigated at various surfaces. Many companies are trying to make a vaccine for this virus, so that, the Moderna American company has been able to get the approval of three phases of making the vaccine. In this review we tried to introduce the SARS-CoV-2 and review the preventive instructions and related literature.