flyway

In 2017, an outbreak of H7N9 occurred along the Mississippi flyway, probably starting in late February, but reported only in March.

Ultimately, the environmental alterations humans have made, like developing farmland underneath one of the greatest migratory bird flyways, serve to provide avian influenza with a consistent source of hosts.

Instead, it is called D1 and originates from wild birds that likely came along the migratory Pacific flyway.

“The Planning Department recognizes that Chicago’s location along a major flyway poses a hazard for migrating birds,” Mr. Strazzabosco said.

“Texas is really a confluence of a couple of different flyways for migratory birds, and Texas is also an agricultural state, despite having quite large cities,” Boerwinkle said.