5. What are the differences between SARS-CoV-2 and SARS-CoV , MERS-CoV?

In addition to SARS-CoV-2, there are 6 other coronaviruses that are known to infect humans, 4 of which are more common in the population and low pathogenic, generally causing only mild respiratory symptoms similar to the common cold. The other 2 are the already well-studied SARS-CoV and MERS-CoV. SARS-CoV-2 belongs to the β Coronavirus genus. It has envelopes and particles that are round or oval. It's often polymorphic, with a diameter of 60-140nm. The genetic characteristics of SARS-CoV-2 are significantly different from those of SARS-CoV and MERS-CoV.