Figure 4
From: Emergence of zoonotic arboviruses by animal trade and migration

Schematic drawing of the development from an endemic transmission cycle through an epizootic transmission cycle to epidemic transmission of Rift Valley fever virus.
From: Emergence of zoonotic arboviruses by animal trade and migration
Schematic drawing of the development from an endemic transmission cycle through an epizootic transmission cycle to epidemic transmission of Rift Valley fever virus.