DES MOINES, Iowa (AP) — State officials say two more probable cases of bird flu have been found at farms in Iowa. The state agriculture department announced Friday that the avian influenza has been detected at a Wright County farm where about 400,000 chickens are being raised and at a Sac County turkey farm with about 42,000 birds.

Initial testing was positive for the bird flu and samples have been sent to a federal lab in Ames for confirmation. If confirmed, the birds will be euthanized. The two cases Friday followed the Thursday announcement that a turkey farm with 17,000 birds in Hamilton County had tested positive for the disease.

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