Food poisoning from eggs “the worst thing I’ve ever been through”

Are eggs from cage-free hens safer?


It’s the worst thing I’ve ever been through,” Robin Shaffer recalled. “I had no energy. You’d try to keep something in you and it just comes out.”

When Shaffer ate an enchilada, bean burrito, and chile relleno combo meal at a Mexican restaurant in Bemidji, Minnesota, a few years ago, she had no idea that raw eggs tainted with Salmonella bacteria had contaminated her food in the kitchen. That food poisoning from eggs would knock Shaffer off her feet for three weeks. “My life was literally the toilet,” she told a local TV station.

Shaffer and six other diners at the restaurant were among the first of what would become more than 1,600 documented victims of the largest outbreak of Salmonella enteritidis food poisoning from eggs since the government began compiling statistics in 1973.



In an unprecedented development, the owner of the company responsible for this outbreak, Jack DeCoster, along with his son Peter were sentenced to three months in prison after pleading guilty to misdemeanor food safety violations. His company was also fined $6.8 million dollars and placed on probation for three years. The court was aware of “a pretty long and sordid history that the DeCosters had with respect to egg production over the last 20-plus years,” explained Bill Marler, a leading food-safety attorney in Seattle.

A federal appeals court denied the men’s appeal this summer and they are expected to appeal their case to the U.S. Supreme Court.


Following the food poisoning trail

After Robin Shaffer and restaurant-goers in at least 10 states became infected by Salmonella, epidemiologists in Minnesota and California were able to finger the likely source: two factory farms in Iowa that together produce more than a billion eggs a year.

But Wright County Egg and Hillandale Farms didn’t just supply restaurants. Their eggs were also sold in bulk to other companies that packaged them for resale in supermarkets under evocative brand names like Sunny Farms, Sunny Meadow, and Wholesome Farms.


What FDA found

When inspectors from the Food and Drug Administration finally descended on the two farms, what they found was anything but “sunny” or “wholesome.”

Both companies’ laying houses, which each held tens of thousands of hens, were infested with flies, maggots, wild birds, and rodents. Chicken manure was piled four to eight feet high below some of the cages. Any of that might have been the source of the food poisoning from eggs.

In fact, Congressional investigators discovered that Wright County Eggs had detected Salmonella on its equipment and in its barns at least 73 times during the previous two years. While the companies agreed to recall a half billion of their eggs, by that point most of them had probably already been eaten.

“There is no question that these farms were not operating with the standards of practice that we consider responsible,” said Margaret Hamburg, FDA Commissioner at the time.

Yet neither egg operation had ever been inspected by the FDA. (The agency rarely checks food plants.) The FDA has said since then that it intends to inspect all 600 of the major U.S. egg producers.


Do crowded hens lead to food poisoning from eggs?

Most eggs are laid by hens that are confined for their lifetimes in battery cages, typically five to eight hens to a cage. The cages are arrayed in “batteries”—rows of cages stacked one atop another. Within each cage, every hen has about 67 square inches of floor space, less than the size of a piece of typing paper. That’s not enough room for them to stretch their wings or engage in other activities that are natural for hens—like nesting, perching, and rolling around on the ground (dustbathing).

It’s also not enough room for them to lay their eggs like uncaged chickens can. “The birds suffer from extraordinary frustration on a daily basis,” says Paul Shapiro of The Humane Society of the United States.

“Chickens in nature have a very strong desire to lay their eggs in a private, dark, secluded nesting area, but battery cages don’t allow them to do that.

A smaller number of laying hens live in indoor “cage-free” houses, where they can walk around, spread their wings, lay their eggs in nests, and, in some facilities, perch and dust-bathe. But most cage-free hens aren’t free to wander outside.


Are cage-free eggs more likely to be free of Salmonella and other contaminants?

It’s not clear. “The evidence suggests that cage-free facilities have significantly lower risks of Salmonella infection,” says The Humane Society’s Paul Shapiro.

That evidence comes from Europe. In 2004 and 2005, for example, the European Food Safety Agency took samples from more than 5,300 egg-laying facilities in 24 countries.

“Across the board, it found a higher risk of Salmonella in the caged facilities,” says Shapiro.

But European egg facilities are smaller and are different in other ways, argue U.S. producers. Battery cages are the most effective way to separate hens and their eggs from bacteria-containing excrement, they maintain. And keeping five to eight birds in their own cage reduces the possibility of their transmitting disease to other hens in the flock.

Who’s right? There’s not enough reliable data to tell.

“We really don’t know if there is a big difference” between Salmonella levels in caged and cage-free hens, says animal nutritionist Jeffrey Armstrong, now president of California Polytechnic State University. “Anyone who says that the evidence is clear, they’re not reading all of the scientific literature.” Armstrong has consulted for the board of the Animal Welfare Advisory Committee of the United Egg Producers, an industry group.

A recent U.S. Department of Agriculture study found no difference in levels of Salmonella and Campylobacter bacteria on eggs laid in conventional cages versus eggs laid in cage-free facilities.


FDA’s advice

To prevent illness from bacteria-contaminated eggs, the Food and Drug Administration recommends that consumers  keep eggs refrigerated, cook eggs until yolks are firm, and cook foods containing eggs thoroughly.


Source: Poult. Sci. 94: 544, 2015.

This post has been updated since it originally appeared in 2015.

Find this article about egg safety interesting and useful? Nutrition Action Healthletter subscribers regularly get sound, timely information about how nutrients can affect their health. They also receive science-based advice about diet and diabetes, heart disease, cancer, osteoarthritis, and other chronic diseases; delicious recipes; and detailed analyses of the healthy and unhealthy foods in supermarkets and restaurants. If you’re not already subscribing to the world’s most popular nutrition newsletter, click here to join hundreds of thousands of fellow health-minded consumers.