Why are Goldfish crackers being recalled?

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First Ritz crackers and now Goldfish. Two popular snacks are being recalled because they might be contaminated with salmonella.

The recall might be puzzling. No one has been reported sick, and these are dry, baked goods. How could they even be contaminated by bacteria?

It has to do with that salty coating on the crackers.

Both recalls were forced because an industrial supplier of dried whey has reported possible salmonella contamination.

Whey is a byproduct of dairy processing, used in making cheese and yogurt. And it’s used to make the coating found on many processed foods, including crackers. As with any animal product, it can be contaminated with germs, including salmonella.

“It’s in the seasoning that’s applied,” Bethridge Toovell, a spokeswoman for Pepperidge Farm, which makes Goldfish, told NBC News.

“We were notified by our whey supplier that they had recalled the product,” Toovell said. “When we looked through and conducted an assessment, a thorough investigation, we determined there was a very low risk. But out of an abundance of caution for our consumers, we erred on the side of recall.”

The Food and Drug Administration has stressed that the products were recalled out of caution. None of the recalled products has tested positive for salmonella. “The company is conducting this recall as a precaution, based on the ingredient supplier’s recall,” the FDA said in a statement.

Salmonella is a very common germ, the Centers for Disease Control and Prevention says.

“CDC estimates salmonella causes about 1.2 million illnesses, 23,000 hospitalizations, and 450 deaths in the United States every year. Food is the source for about 1 million of these illnesses,” the CDC says on its website.

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Germs can get into just about any product and cooking doesn’t always kill them. In 2016, uncooked flour caused an outbreak of E. coli infections.

Right now, the CDC and the FDA are cautioning people about salmonella in raw turkey products, packaged pasta salad, crackers and breakfast cereal. Last month, an outbreak linked to cut melon made 70 people sick in seven states.

An outbreak of salmonella traced to Honey Smacks cereal has sickened 100 people in 33 states.

Consumers are told to throw away all foods affected in a recall because it’s impossible to tell that a product has been contaminated by looking at it.

“Contaminated foods usually look and smell normal,” the CDC said. “They are often foods of animal origin, such as beef, poultry, milk, fish or eggs, but any food, including vegetables and fruit or processed foods, may become contaminated.”

The recall linked to the dried whey is affecting certain Goldfish products — not all — as well as certain Ritz Bits and Ritz cracker sandwiches. It’s also affected a few bread products: Mrs. Freshley’s, Food Lion, H-E-B supermarket, Baker’s Treat, Market Square, Great Value and Captain John Derst’s Old Fashioned Bread, the FDA said.

“Consumers who have these products should not eat them, and should discard any products they may have,” the FDA said.

Salmonella is usually not serious. Most people infected develop diarrhea, fever and abdominal cramps 12 to 72 hours after infection. The illness usually lasts four to seven days, and most people recover without treatment, the CDC says.

“However, in some persons, the diarrhea may be so severe that the patient needs to be hospitalized,” the CDC says.