DES MOINES (AP) — Two more cases of bird flu have been found at Iowa turkey farms.

The Iowa Agriculture Department announced Monday that the avian influenza had been confirmed at a farm in Hamilton County with 36,000 turkeys and that a preliminary test for the disease was positive at a Calhoun County farm with 21,000 birds. A federal lab in Ames will test the Calhoun County samples.

Once the flu is confirmed at a farm, all the birds are euthanized.

The Agriculture Department says the virus has infected poultry at farms with more than 26 million birds. 

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