SARS-CoV-2 has been evolving for at least 7 years
The current COVID-19 pandemic demonstrates the vast unknown of virology, which continues to challenge the ability of humanity to remain healthy when faced with pathogens. While most known microbes have restricted affinity for specific species, continuing to adapt with the host species, the severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) has crossed over from an unknown animal reservoir, like the preceding SARS and MERS coronaviruses, to infect human cells. Such viruses are typically more readily infective and cause more severe disease, as they have not yet adapted fully to the target host.
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