“It’s just a numbers game,” WCS's Dr. Christian Walzer told Mongabay of markets that trade in wildlife. “If you just put enough species together and allow them to share viruses and then put a lot of people in contact with the animals and their parts, then you just invariably will have a virus that can enter a human cell and replicate and, in rarer occasions, transmit from human to human.”
![](/Portals/173/images/photos/Wildlife%20Trade/Wildlife%20traded%20in%20local%20market%20in%20Lao%20PDR.png?ver=2020-01-24-151727-603)