SARS - CoV-2 is a new RNA virus
Whether the transmissibility and pathogenicity of SARS - CoV-2 is actively evolving , and driven by adaptation to the new host and environments is still unknown .
SARS - CoV-2 is a new RNA virus affecting humans and spreads extensively through world populations since its first outbreak in late December , 2019 .
Whether the transmissibility and pathogenicity of SARS - CoV-2 is actively evolving , and driven by adaptation to the new host and environments is still unknown .