"It soon became clear, however, that the decision was a precursor to the spread of new #viruses. As the industry developed, in limited spaces huge #markets emerged, selling a wide variety of animals: #rhinos, #wolves, #mice, crocodiles, ducks and snakes, alongside pigs, chickens and more. Where there is a concentration of large animal populations, there is an opportunity for an animal disease to spread to other species and on to man—which is exactly what happened."