Climate Change-Driven Microbial Dynamics in Food Systems: Implications for Pathogen Emergence, Food Safety, and Global Human Health

Abstract

Climate change is fundamentally reshaping microbial communities throughout the global food supply chain, driving the emergence and re-emergence of foodborne pathogens with profound consequences for food safety and human health. Rising temperatures, altered precipitation patterns, extreme weather events, and sea-level rise accelerate microbial metabolism, stress adaptation, biofilm formation, and horizontal gene transfer, expanding the geographic and seasonal range of key bacteria such as Salmonella, Campylobacter, Vibrio, and Shiga toxin-producing E. coli, as well as norovirus, protozoan parasites, and mycotoxin-producing fungi. These climate-driven dynamics intensify contamination risks at every stage from drought-stressed irrigation and flood-mobilized runoff in production fields to disrupted cold chains in processing, storage, and distribution while promoting zoonotic spillover, antimicrobial resistance, and supply-chain vulnerabilities. The result is a sharply rising global disease burden that disproportionately affects children, the elderly, immune-compromised individuals, and low-income regions, with stark regional disparities across Africa, Asia, Europe, and the Americas and trillions in combined economic and public-health costs. Observational studies, modeling projections, and field evidence confirm that specific climate variables directly correlate with increased incidence and outbreak severity. Practical mitigation and adaptation strategies including climate-informed HACCP and Quantitative Microbial Risk Assessment, climate-smart agriculture, enhanced One-Health surveillance with whole-genome sequencing and predictive modeling, targeted education, and strengthened international policy cooperation offer scalable solutions. Addressing remaining gaps in longitudinal data, mechanistic research, regional models, and equity considerations is essential. Urgent, coordinated global action is required to safeguard food safety and public health in a rapidly warming world.

Keywords: Climate change, foodborne pathogens, microbial dynamics, pathogen emergence, food safety, One Health