A salmonella outbreak that has slowly grown to nearly 300 cases in 39 states since August has been linked to tainted peanut butter, federal health officials said.
It is believed to be the first salmonella outbreak associated with peanut butter in U.S. history, said officials with the Centers for Disease Control and Prevention.
About 20 percent of the 288 infected people have been hospitalized, but none has died, said Dr. Mike Lynch, a CDC epidemiologist.
About 85 percent of the infected people said they ate peanut butter, CDC officials said.
How salmonella got into peanut butter is still under investigation, Lynch said.
The brands pulled from the shelves are Peter Pan and Wal-Mart's Great Value peanut butter — both made by ConAgra — if the jar's product code began with serial number 2111, reports CBS News correspondent Mark Strassmann. Health inspectors traced the problem to a peanut butter factory in southern Georgia that has since been closed.
Great Value peanut butter made by other manufacturers is not affected, according to the Food and Drug Administration.
ConAgra said it is recalling all Peter Pan and Great Value peanut butter beginning with product code 2111.
The largest number of salmonella cases were reported in New York, Pennsylvania, Virginia, Tennessee and Missouri.
Salmonella infection is known each year to sicken about 40,000 people in the United States, according to the CDC. Salmonellosis, as the infection is known, kills about 600 people annually.
Symptoms of salmonella can include diarrhea, fever, dehydration, abdominal pain and vomiting.
The salmonella scare comes on the heels of two nationwide outbreaks last fall of the E. coli bacteria, linked to produce.
The new outbreak began in August, but just two or fewer cases have been reported each day, CDC officials said.
It was only in the past few days that investigators were able to hone in on a particular food, Lynch said.
ConAgra is destroying all affected products the company still has, the FDA said.
The company will cease production until the exact cause of contamination can be identified and eliminated. Meanwhile, ConAgra advised consumers to destroy any Peter Pan and Great Value brand peanut butter beginning with product code 2111.
The FDA sent investigators to ConAgra's processing plant in Sylvester where the products were made to review records, collect product samples and conduct tests for salmonella.
A recent CBS News poll found that only 15 percent of Americans have a great deal of confidence in the government's ability to protect from food-borne illness.
CBS News correspondent Wyatt Andrewsthat some lawmakers and food regulation experts believe the American food supply is risk-prone due to poor coordination among federal agencies.
"There's no one in charge in the federal food safety system," Mike Taylor, a former USDA and FDA food safety official told Andrews.
Taylor says most food safety money — 80 percent — goes to the USDA, which visually inspects meat in slaughterhouses, while millions of Americans actually get sick from the invisible germs in produce.
During the past 10 years, Congress has been warned again and again that the food safety system is an organizational mess that does not fully protect consumers, reports Andrews.
But the spinach outbreak last year led to new calls for reform. One idea: Create a single food agency to finally put someone in charge.
Sen. Dick Durbin, the second-ranking Democrat in the Senate, says he thinks a single food agency would have traced the last outbreak more quickly. He says under one agency, money could be focused on disease prevention.