The spillover of viruses from wild animals to cause human disease is a complex ecological process. A recent paper connects the dots.
Rowan, Andrew N.
"A Swift Kick in the Pandemics: Identifying Spillover Dynamics,"
WellBeing News: Vol. 5:
5, Article 1.
Available at: https://www.wellbeingintlstudiesrepository.org/wbn/vol5/iss5/1