Searching for the next virus The Covid-19 pandemic is not over yet, but some researchers are already worrying about mousepox. Colin Carlson, a biologist at Georgetown University, has spent the last few years training computers to predict which dangerous viruses could jump from animals to humans, following in the footsteps of the coronavirus (which came from bats), H.I.V. (chimpanzees) and hundreds of other pathogens. His team used machine learning to develop a short list of potentially dangerous viruses that could eventually make a leap. Mousepox — a virus that infects…