SARS - CoV-2 is a new RNA virus
and spreads extensively through world populations since its first outbreak in late December , 2019 .
SARS - CoV-2 is a new RNA virus affecting humans and spreads extensively through world populations since its first outbreak in late December , 2019 .
SARS - CoV-2 is a new RNA virus affecting humans and spreads extensively through world populations since its first outbreak in late December , 2019 .