Two Iowa egg companies – Wright County Egg and Hillandale Farms – recalled some 500 million eggs after officials linked the facilities to a surge in salmonella cases. The recall involved distributors to the Lower 48 states, but to date there have been no fatalities linked to the eggs.FDA Commissioner Margaret Hamburg said Monday that new rules that went into effect last month giving the FDA authority to test eggs for salmonella "very likely" would have enabled the FDA to flag the problem before the outbreak.