An illustration of SARS-CoV-2 Gerd Altmann/Pixabay
Over the past two years, we have witnessed evolution in action, with new variants of the coronavirus becoming increasingly contagious. But where will it end? Is there a ceiling that viruses reach where they can’t become any more contagious?
Viruses tend to become more contagious over time because natural selection favours mutations that increase their ability to spread, says at the Peter Doherty Institute for Infection and Immunity in Melbourne, Australia, who is a member of the World Health Organization’s Technical Advisory Group on SARS-CoV-2 Virus Evolution.
Measles is perhaps…
