[Comment: The clade 2.3.2 in Indonesia, Vietnam, Bangladesh, is deadly for ducks]
Excerpt from the original article:
However, the primary focus of the scientists is the flu, although
it's not what most think of when it comes to the flu. No runny duckbills
or chicken soup for these guys. Brandt Meixell, a wildlife biologist
and co-investigator with the U.S. Geological Survey Alaska Science
Center, said it's almost impossible to tell apart a sick duck from a
healthy one and the virus very rarely leads to death.
“Holding one bird that has it and one that doesn't -- there's no discernible difference,” Meixell said.
Duck influenza hasn't received as much attention as avian influenza.
So far as is known, it stays within bird populations, only produces mild
illness and cannot be transferred to humans.
The virus generally moves through the birds in the fall, especially
young ducks, thanks to their “naive” immune systems, Meixell said. Not
only are the Chena birds all staying back for winter, they're also
packed tightly together allowing for easy transmission of the virus.
Checking them throughout the winter will give scientists a better idea
how long the virus and its antibodies remain in the animals.