(Des Moines) H5 avian influenza has been confirmed in Canada geese at Green Valley Lake and at Lake of Three Fires, state wildlife officials announced on Thursday.
Staff with the Iowa Department of Natural Resources (DNR) collected dead geese for testing at Iowa State University’s Veterinary Diagnostic Lab. Results were available late Wednesday.
Reports of dead geese at Green Valley Lake began on Dec. 11. Local staff began collecting geese off the ice but paused when weather conditions changed. As mild weather returned and the winds changed, the geese were more accessible and collection resumed.
So far, an estimated 60 geese have been collected at the popular southwest Iowa state park.
Local staff estimate thousands of geese are currently at Green Valley Lake as part of their fall migration.
The Canada goose migration had increased across much of Iowa since the end of November with the onset of cold, snowy weather. The Iowa DNR’s December 12 waterfowl survey showed the Canada goose population increased more than 30 percent over the previous week as northern lakes and marshes froze and fields were covered in snow.
“We are getting reports of influenza activity across the western half of the state, and, for the first time, mass mortality events impacting southwest Iowa which has remained fairly insulated since 2022,” said Dr. Rachel Ruden, state wildlife veterinarian with the Iowa DNR.
How long the outbreak will last is uncertain. As the rain and mild weather open up additional feeding and roosting locations, waterfowl will disperse which should reduce opportunities for transmission.
The public is encouraged to keep their distance from sick geese or those that are easily approached without obvious sign of injury. Also keep pets from interacting with sick or dead birds or consuming carcass parts. While no human cases of H5 avian influenza have been linked to wild birds in the United States, there have been numerous cases linked to close contact with infected poultry and dairy cattle. Sick birds should not be handled or brought into shared living spaces.
Residents who see 20 or more carcasses in a small area are encouraged to call their local wildlife staff. Information is available online at https://www.iowadnr.gov/about/contact/staff-offices then scroll down to Wildlife Management Staff. Residents who find a single or a few birds can follow the steps for collection and disposal listed online at https://homelandsecurity.iowa.gov/resources/avian-influenza-resources.
“We encourage the public to report sick birds or other wildlife to your local wildlife biologist or conservation officer to help us track impacts of this disease. We all have a part to play in keeping Iowa’s wildlife healthy,” said Dr. Ruden.
