The #Delta variant’s spread saw a surge in #COVID19 cases. But is that because it's more dangerous than other variants - or is it more to do with human behaviour? "All of the proclamations about transmissibility are made because we see variants suddenly emerging and then dominating and spreading through the population," says US virologist Vincent Racaniello. But that doesn’t necessarily mean they're more transmissible. In fact, the scientist says human behavior is far ...