The CDC said the outbreak of salmonella infections linked to certain Jif peanut butter products is over.
The outbreak triggered a massive recall in May. The FDA has also completed its investigation.
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The peanut butter products that were linked to the outbreak were produced at a J.M. Smucker Company facility in Lexington, Kentucky.
J.M. Smucker Company voluntarily recalled certain Jif brand peanut butter products that had lot code numbers 1274425 through 2140425 and the first seven digits ended with 425.
The FDA is preparing a report to share its findings and provide information meant to help prevent future outbreaks.
Read: Salmonella outbreak triggers recall of Jif peanut butter: What to know
What is Salmonella?
Salmonella are a group of bacteria that can cause gastrointestinal illness and fever called salmonellosis.
Most people infected with Salmonella will begin to develop symptoms 12 to 72 hours after infection. The illness usually lasts four to seven days and most people recover without treatment.
Symptoms include diarrhea, fever, and abdominal cramps. More severe cases of salmonellosis may include a high fever, aches, headaches, lethargy, a rash, blood in the urine or stool, and in some cases may become fatal.
Children younger than five, the elderly, and people with weakened immune systems are more likely to have severe salmonellosis infections.
How many people became ill?
According to the CDC, there were 21 total illnesses linked to the impacted peanut butter and four people were hospitalized.
The illnesses were in 17 states and no deaths were reported. Only one illness was reported in someone from Michigan.
Read: Salmonella outbreak triggers recall of products that used Jif peanut butter: What to know