An outbreak of bird flu in the Midwest is forcing farmers to euthanize many sick chickens, causing egg prices to rise dramatically, reported Jonathan Bloom on ABC News 7 in San Francisco. Bloom spoke with UC Agriculture and Natural Resources Cooperative Extension poultry specialist Maurice Pitesky via Skype. He said the disease, highly contagious in chickens and turkeys, is being spread by migrating geese.

"And they're not, for the most part, affected by the disease, but they can be carriers of it," Pitesky said. "It means we're euthanizing those flocks that are affected."

The story said 40 million laying hens, one-eighth of the country's laying population, had to be euthanized, dramatically reducing the egg supply. Turkeys are still more susceptible to the condition.

“Turkey prices are going up also, and we're still not sure how that will affect turkey prices around Thanksgiving," Pitesky said.

California chickens haven't been hit by bird flu, but they are producing fewer eggs because new laws went into effect this year requiring more room for hens to move around, reducing some farms' capacity.