(CNN) A new genetic analysis of the virus that causes Covid-19 taken from more than 7,600 patients around the world shows it has been circulating in people since late last year, and must have spread extremely quickly after the first infection. Researchers in Britain looked at mutations in the virus and found evidence of quick spread, but no evidence the virus is becoming more easily transmitted or more likely to cause serious disease. "The virus is changing, but this in itself does not mean it's getting worse," genetics researcher Francois Balloux of the University College London Genetics Institute told CNN. Balloux and colleagues pulled viral sequences from a giant global database that scientists around the world are using to share data. They looked at samples taken at different times and from different places, and said they indicate that the virus first started infecting people at the end of last year.

Source: CNN May 06, 2020 00:33 UTC