Infection Dynamics and Risk Assessment of Cronobacter Species

Cronobacter species are opportunistic pathogens best known for causing severe neonatal infections, including meningitis, septicaemia and necrotising enterocolitis. Their remarkable ability to survive and persist in low-moisture environments, notably powdered infant formula and feeding equipment, underlies a complex transmission cycle. Infection dynamics are shaped by biofilm formation on biotic and abiotic surfaces, strain-specific virulence factors and host susceptibilities. Risk assessment frameworks integrate quantitative microbial risk assessment models that account for bacterial load in formula, preparation practices, storage conditions and infant vulnerability. Global surveillance highlights the ubiquity of Cronobacter in manufacturing and domestic settings, necessitating interventions spanning good manufacturing practices, enhanced hygienic design of processing lines and caregiver education. Ongoing research seeks to refine dose–response relationships, to elucidate interspecies and intraspecies variability in environmental resilience, and to develop robust control strategies that mitigate infection risk from farm to fork.

Research from Nature Portfolio

Recent studies have revealed that natural plant extracts can modulate Cronobacter virulence. In particular, citral—a major component of lemongrass oil—has been shown to diminish motility, interfere with cell–cell communication (quorum sensing) and reduce biofilm formation. Exposure of Cronobacter sakazakii to sub-inhibitory concentrations of citral also lowers endotoxin release and impairs bacterial adhesion to and invasion of intestinal epithelial cells. Gene expression analyses indicate downregulation of key virulence-associated loci, pointing to a promising adjunct approach for controlling Cronobacter contamination in food matrices and reducing infection risk in vulnerable neonates.

Infection Dynamics and Risk Assessment of Cronobacter Species publication trend

The graph below shows the total number of articles in infection dynamics and risk assessment of cronobacter species across all publications each year (not limited to Nature Index journals).

Technical terms

Biofilm formation: The process by which bacterial cells adhere to surfaces and produce a protective matrix, enhancing survival under adverse conditions.

Multilocus sequence typing (MLST): A molecular typing method that sequences fragments from multiple housekeeping genes to assign isolates to sequence types and clonal complexes.

Clonal complex: A group of closely related bacterial strains sharing similar sequence types, often linked to specific pathogenic traits or outbreak clusters.

Desiccation resistance: The capacity of bacteria to survive and remain viable after exposure to dry conditions for extended periods.

References

1. Invasive Enterobacter sakazakii Disease in Infants - Volume 12, Number 8—August 2006 - Emerging Infectious Diseases journal - CDC. Emerging Infectious Diseases (2006).
2. Outbreak History, Biofilm Formation, and Preventive Measures for Control of Cronobacter sakazakii in Infant Formula and Infant Care Settings. Microorganisms (2019).
3. Cronobacter, the emergent bacterial pathogen Enterobacter sakazakii comes of age; MLST and whole genome sequence analysis. BMC Genomics (2014).
4. Inhibition of Cronobacter sakazakii Virulence Factors by Citral. Scientific Reports (2017).
5. Antibiotic and Desiccation Resistance of Cronobacter sakazakii and C. malonaticus Isolates from Powdered Infant Formula and Processing Environments. Frontiers in Microbiology (2017).