Dean noted the administration blocked attempts to ban from the food supply beef from cows slaughtered when they were unable to walk -- a symptom of the disease -- and resisted efforts to create a better system to track cows.

CNN: Democrats criticize administration over mad cow

Also on Thursday, British authorities said they found the presence of an equine veterinary drug in carcasses of slaughtered horses that may have entered the food chain, escalating the scandal from one of mislabeling to one with potential health implications.

WSJ: U.K. Arrests Men in Horse-Meat Probe

The outbreak has sparked concern about a possible spike in food prices, but authorities said Monday that the number of slaughtered chickens is a small fraction of the country's overall population and there is no reason for egg or chicken prices to increase.

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