The authors suggest that such transmission events are perpetuated mainly by the movement of poultry and poultry products, rather than by migrating birds.

ECONOMIST: The aves, and ave nots

These vast networks carried more than just merchandise and precious commodities: the constant movement and mixing of populations also brought about the transmission of knowledge, ideas, cultures and beliefs, which had a profound impact on the history and civilization of the Eurasian peoples.

UNESCO: Culture

The incessant movement of peoples and goods along these routes resulted in an unprecedented transmission and exchange of knowledge, ideas, beliefs, customs and traditions over three millennia.

UNESCO: CULTURE