Related Experiment Video
Updated: Jul 8, 2026

Modified Most Probable Number Assay to Quantify Salmonella in Raw and Ready-to-Cook Chicken Products
Published on: January 31, 2025
Powdered infant formula as a source of Salmonella infection in infants
Sarah M Cahill1, I Kaye Wachsmuth, Maria de Lourdes Costarrica
1Food and Agriculture Organization of the United Nations, Rome, Italy. sarah.cahill@fao.org
Insights
Powdered infant formula can contain harmful Salmonella bacteria, leading to infant illness. Enhanced surveillance and a multi-faceted approach involving manufacturers, regulators, and caregivers are crucial for managing this risk.
Area of Science:
- Food safety
- Microbiology
- Pediatric health
Background:
- Powdered infant formula (PIF) is not sterile and can harbor pathogens like Salmonella enterica.
- Contaminated PIF has been linked to multiple outbreaks of Salmonella infections in infants.
- Low levels of Salmonella in PIF can evade routine detection, complicating identification.
Purpose of the Study:
- To highlight the risk of Salmonella contamination in powdered infant formula.
- To discuss the challenges in detecting low-level contamination.
- To emphasize the need for a comprehensive strategy to mitigate risks.
Main Methods:
- Review of reported Salmonella outbreaks linked to PIF.
- Analysis of surveillance data and laboratory capabilities for Salmonella serotyping.
- Discussion of detection limitations in routine testing.
Main Results:
- At least six infant Salmonella outbreaks were linked to PIF consumption in recent years.
- Unique Salmonella serotypes and robust surveillance networks aided outbreak identification.
- Low bacterial loads in formula often challenge routine detection methods.
Conclusions:
- Salmonella contamination in PIF poses a significant risk to infant health.
- Current surveillance and detection methods may underestimate the true incidence of infections.
- A collaborative, multidimensional approach involving manufacturers, regulators, and caregivers is essential for effective risk management.
Abstract:
Powdered infant formula is not sterile and may be intrinsically contaminated with pathogens, such as Salmonella enterica, that can cause serious illness in infants. In recent years, at least 6 outbreaks of Salmonella infection in infants that have been linked to the consumption of powdered infant formula have been reported. Many of these outbreaks were identified because the Salmonella strains were unique in some way (e.g., a rare serotype) and a well-established Salmonella surveillance network, supported by laboratories capable of serotyping isolates, was in place. Another common feature of the outbreaks was the low level of salmonellae detected in the implicated formula (salmonellae may be missed in routine testing). These outbreaks likely represent only a small proportion of the actual number of Salmonella infections in infants that have been linked to powdered infant formula. Managing this problem requires a multidimensional approach in which manufacturers, regulators, and caregivers to infants can all play a role.
Related Concept Videos
Reservoir of Infection
Sources of Food Contamination
Investigation of Disease Outbreaks
Bacterial Gastroenteritis
