A man gets a nucleic acid test at a makeshift testing site in a park following an outbreak of the coronavirus disease in Beijing, China, on Saturday (Jan 23, 2021. - Reuters
PARIS/HONG KONG, Jan 23, 2021 (AFP): The emergence of several, more infectious strains of the novel coronavirus SARS-CoV-2 has worried governments and scientists, who are investigating how and why the virus became more transmissible.
Like all viruses, SARS-CoV-2 mutates in order to maximise its survival chances.
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