The Delta variant, also referred to as a "double mutant" because it carries two mutations, is 55 per cent more transmissible ...
One thing we know for sure about SARS-CoV-2, the virus that causes COVID-19, is that it keeps changing. Since the start of the pandemic, we have seen several notable variants, including Alpha, Beta, ...
The World Health Organization and the Centers for Disease Control and Prevention have both designated beta as a “variant of ...