Hillandale Farms

Eggs are heading back to store shelves from Hillandale Farms, one of two big Iowa egg producers who in August recalled more than 500 million eggs because of Salmonella contamination that sickened more than 1,600 people. The Food and Drug Administration on Monday night announced it had approved...

The Food and Drug Administration and the Justice Department have joined an investigation into the massive egg recall. Meanwhile, former USDA egg graders say their complaints of unsanitary conditions, including towering piles of manure, were ignored.

The recall of half a billion eggs potentially tainted by salmonella has scared shoppers, who are increasingly willing to pay higher prices for safer eggs. Organic and premium egg producers are now struggling to keep up with demand.

Following a salmonella outbreak, Hillandale Farms has added a recall of more than 170 million eggs to Wright County Egg's earlier recall of 380 million. That's a lot of bad eggs, making this one of the largest egg recalls in recent history.