Descrizione
The western world has enjoyed decades without major outbreaks of infectious diseases thanks to modern medicine. Over the same period of time, the world population has grown exponentially, and people have become wealthier, allowing more people to go on international holidays. Global trade and travel increased in proportion to the economic growth, with billions of people traveling across national borders in 2019. At the same time, humans have encroached on the natural habitats of wild animals.