Investigation Details
CDC, public health and regulatory officials in several states, and the U.S. Food and Drug Administration (FDA) collected different types of data to investigate a multistate outbreak of Salmonella Senftenberg infections.
Epidemiologic and laboratory data showed that Jif brand peanut butter made people sick.
As of July 27, 2022, this outbreak is over.
Epidemiologic Data
As of July 27, 2022, a total of 21 people infected with the outbreak strain of Salmonella Senftenberg were reported from 17 states (see map). Illnesses started on dates ranging from February 20, 2022, through May 24, 2022 (see timeline).
Sick people ranged in age from less than one to 85 years, with a median age of 59, and 75% were female. Of 13 people with information available, 4 were hospitalized. No deaths were reported.
State and local public health officials interviewed people about the foods they ate in the week before they got sick. Of the 13 people interviewed, 13 (100%) reported eating peanut butter in the week before they got sick. This percentage was significantly higher than results from a survey of healthy people, in which 57% of respondents reported eating any peanut butter in the week before they were interviewed. This suggests that people in this outbreak got sick from eating peanut butter. All 13 people reported eating Jif brand peanut butter specifically.
Laboratory Data
Public health investigators used the PulseNet system to identify illnesses that were part of this outbreak. CDC PulseNet manages a national database of DNA fingerprints of bacteria that cause foodborne illnesses. DNA fingerprinting is performed on bacteria using a method called whole genome sequencing (WGS). WGS showed that bacteria from sick people’s samples were closely related genetically. This means that people in this outbreak likely got sick from the same food.
FDA conducted WGS analysis on an environmental sample collected at the Lexington, Kentucky, J.M. Smucker Company facility in 2010. The analysis shows that this 2010 environmental sample was closely related genetically to the outbreak strain.
WGS analysis of bacteria from 21 people’s samples did not predict resistance to any antibiotics. Standard antibiotic susceptibility testing by CDC’s National Antimicrobial Resistance Monitoring System (NARMS) laboratory was underway at the time this investigation closed.
Public Health Actions
On May 20, 2022, J.M. Smucker Company recalled multiple Jif brand peanut butter types made at the Lexington, Kentucky, facility. Additional companies recalled foods made with Jif brand peanut butter.
CDC, public health and regulatory officials in several states, and the U.S. Food and Drug Administration (FDA) are collecting different types of data to investigate a multistate outbreak of Salmonella Senftenberg infections.
Epidemiologic and laboratory data show that some Jif brand peanut butters may be contaminated with Salmonella Senftenberg and are making people sick.
Epidemiologic Data
Since the last update on May 21, 2022, two more illnesses have been reported. As of May 25, 2022, a total of 16 people infected with the outbreak strain of Salmonella Senftenberg have been reported from 12 states (see map). Illnesses started on dates ranging from February 19, 2022, through May 2, 2022 (see timeline).
Sick people range in age from less than one to 85 years, with a median age of 51, and 73% are female. Of nine people with information available, two have been hospitalized. No deaths have been reported.
The true number of sick people in an outbreak is likely much higher than the number reported, and the outbreak may not be limited to the states with known illnesses. This is because many people recover without medical care and are not tested for Salmonella. In addition, recent illnesses may not yet be reported as it usually takes 2 to 4 weeks to determine if a sick person is part of an outbreak.
State and local public health officials are interviewing people about the foods they ate in the week before they got sick. Of the 10 people interviewed, 10 (100%) reported eating peanut butter. Of the nine sick people with brand information, all nine (100%) reported eating Jif brand peanut butter.
Laboratory Data
WGS analysis of 16 people’s samples did not predict resistance to any antibiotics. Standard antibiotic susceptibility testing by CDC’s National Antimicrobial Resistance Monitoring System (NARMS) laboratory is currently underway.
Public Health Actions
On May 20 2022, J.M. Smucker Company recalled multiple Jif brand peanut butter types. Additional companies have recalled food items made with Jif brand peanut butter. Do not eat, sell, or serve recalled foods.
CDC, public health and regulatory officials in several states, and the U.S. Food and Drug Administration (FDA) are collecting different types of data to investigate a multistate outbreak of Salmonella Senftenberg infections.
Epidemiologic and laboratory data show that some Jif brand peanut butters may be contaminated with Salmonella Senftenberg and are making people sick.
Epidemiologic Data
As of May 21 2022, a total of 14 people infected with the outbreak strain of Salmonella Senftenberg have been reported from 12 states (see map). Illnesses started on dates ranging from February 17, 2022, through May 1, 2022 (see timeline).
Sick people range in age from less than one to 85 years, with a median age of 56, and 71% are female. Of 6 people with information available, 2 have been hospitalized. No deaths have been reported.
The true number of sick people in an outbreak is likely much higher than the number reported, and the outbreak may not be limited to the states with known illnesses. This is because many people recover without medical care and are not tested for Salmonella. In addition, recent illnesses may not yet be reported as it usually takes 2 to 4 weeks to determine if a sick person is part of an outbreak.
State and local public health officials are interviewing people about the foods they ate in the week before they got sick. Of the five people interviewed, five (100%) reported eating peanut butter. Four of five (80%) sick people reported Jif brand peanut butter. Two people reported Jif Creamy Reduced Fat peanut butter, one person reported Jif Natural Creamy Low Sodium peanut butter, and one person reported Jif Natural Creamy peanut butter. This suggests that people in this outbreak got sick from eating peanut butter.
Laboratory Data
Public health investigators are using the PulseNet system to identify illnesses that may be part of this outbreak. CDC PulseNet manages a national database of DNA fingerprints of bacteria that cause foodborne illnesses. DNA fingerprinting is performed on bacteria using a method called whole genome sequencing (WGS). WGS showed that bacteria from sick people’s samples are closely related genetically. This suggests that people in this outbreak got sick from the same food.
WGS analysis shows that samples from sick people in this investigation are closely related genetically to a sample collected in 2010 from the environment at J.M. Smucker Company’s facility in Lexington, KY, where some Jif brand peanut butter is produced.
WGS analysis of bacteria from 14 people’s samples did not predict resistance to any antibiotics. Standard antibiotic susceptibility testing by CDC’s National Antimicrobial Resistance Monitoring System (NARMS) laboratory is currently underway.
Public Health Actions
On May 20 2022, J.M. Smucker Company recalled multiple Jif brand peanut butter types. Do not eat, sell, or serve recalled Jif brand peanut butter.
