It has mutated.
Though a random event, a variant is now born. It happens constantly. Fortunately, most of these accidents have no effect on infection, spread, or illness severity and soon disappear. The useful ones, however, the ones that help the virus replicate faster, create champions that can replace previous variants. These are called a strain.
Some virologists believe SARS-CoV-2 emerged through the meeting of a horseshoe bat and a so-called “reservoir” host (like a pangolin) over one year ago. Others believe the virus had already circulated quietly in animals and humans long before mutating into the form that took flight in late 2019. Either way, the virus that causes COVID-19 has been mutating for a year now.
A new paper from a team of