Biosensors Meet Veterinary Controls to Block Zoonotic Food Pathogens

Europe reported 6,558 foodborne outbreaks, 62,481 human cases, 3,336 hospitalizations and 53 deaths in 2024 — and outbreaks rose 14.5 percent over 2023, according to EFSA and ECDC figures cited in a newly published narrative review. The paper, by Liang and colleagues in Food Production, Processing and Nutrition (DOI: 10.1186/s43014-026-00428-2), synthesizes literature from 2019 to 2024 and argues that food safety now requires two arms working together: traditional veterinary public health across the farm-to-fork chain, and biosensors that detect contaminants in minutes rather than days.

The global baseline is worse. The World Health Organization estimates roughly 10 percent of the world's population falls ill from contaminated food each year; 40 percent of foodborne disease cases occur in children under five, with about 125,000 associated deaths annually. Human cases and hospitalizations in Europe climbed 19.7 percent and 15.2 percent respectively in 2024, though deaths fell 18.5 percent.

Which pathogens drive the burden?

The review names Brucella, Listeria, Campylobacter and Salmonella as the leading bacterial threats, alongside foodborne parasites such as Echinococcus and Toxoplasma, whose subtle, long-lasting effects the authors say have often been overlooked. Hepatitis E virus ranks as the most significant viral cause of foodborne illness. Contamination can enter anywhere — primary production, transport, slaughter, processing, storage, distribution or consumption — a complexity that has intensified with globalization of the food supply.

What changes on the farm and at the plant?

Pre-harvest controls center on biosecurity: fencing, quarantine for newly introduced animals, pre-arrival health testing, and strict hygiene rules for workers, vehicles and equipment. Because trucks and visitors are key disease pathways, the authors recommend route-dedicated vehicles, scheduled cleaning and disinfection, and heating boxes plus air-drying after washing — abattoir trucks have tested positive for Salmonella even after cleaning. Beef-exporting countries in southern Africa, the review notes, protect both animal health and market access through foot-and-mouth vaccination of cattle, fencing to separate infected buffalo, and zoning under World Organisation for Animal Health guidelines.

Husbandry matters too: clean water, hygienic feed, clean bedding and avoiding overcrowding cut stress and pathogen exposure. The authors flag excessive antibiotic use as a driver of multidrug-resistant bacteria that can reach consumers through animal-derived products, and call for limiting antibiotic use in livestock, strict border veterinary inspections, testing protocols and public awareness campaigns.

Post-harvest evidence is blunt. A report from Bishoftu, Ethiopia, documented abattoirs lacking hot water for knife dipping and hand-washing; roughly 40 percent of employees had no hygienic meat-handling training and 53.6 percent did not wash their hands, with carcasses often stored at room temperature. Mechanized hanging, hide removal and evisceration reduce cross-contamination compared with manual methods.

Thermal parameters are quantified. Campylobacter jejuni dies at 53°C with a D value of 293.4 in ground chicken breast; E. coli O157:H7 dies at 65°C with a D value of 13.8 in beef patties. High-pressure processing at 300–600 megapascals for 3–10 minutes at chilled temperatures achieves a 2–5 log reduction of zoonotic pathogens in fish and meat.

Downstream, the review recommends refrigerated transport, routine vehicle sanitization and antimicrobial packaging, including chitosan-based films, biodegradable polymer composites and micro- and nano-encapsulated antimicrobial agents. Consumers knowledgeable about foodborne pathogens follow safety procedures more often — but knowledge alone does not guarantee practice, with socio-economic factors, time and money shaping behavior. Social media and accessible education programs are identified as effective channels.

How fast can biosensors detect pathogens?

The review's distinctive claim is that biosensors complement rather than replace veterinary inspection. The catalog is concrete:

• A wireless magnetoelastic biosensor detected Salmonella Typhimurium on eggshells at 0.6–1.6 × 10⁷ CFU/cm² within 30 minutes.
• A lateral flow aptamer sensor detected E. coli O157:H7 at 10 CFU/mL; surface-enhanced Raman spectroscopy with metal nanoparticles detected the same pathogen in food and water in 20 minutes.
• CRISPR/Cas12a systems with recombinase-aided amplification detected E. coli O157:H7 at roughly 1 CFU/mL by fluorescence within 55 minutes; a Cas12a sensor for Listeria monocytogenes reached limits of 0.68 attomolar genomic DNA and 940 CFU/g in spiked meat within two hours.
• Nucleic acid-based sensors promise Campylobacter detection in eggs down to 1 CFU/mL; a lateral flow test verified C. jejuni in barn litter at 6.7 log CFU/g and cecal contents at 7.1 log CFU/g.

Poultry-focused sensors have detected Campylobacter, Salmonella, E. coli, Clostridium perfringens and Mycoplasma gallisepticum in hens. Aptamers beat antibodies on field stability, though immuno-based methods risk cross-reactivity and false positives. Electrochemical sensors using potentiometry, conductometry and impedimetry — enhanced by carbon nanotubes and metal oxide nanoparticles — offer portable, low-cost, point-of-care detection.

What does regulation require?

The review traces the shift to risk-based meat assurance, born from visual inspection's blindness to invisible hazards such as antimicrobial-resistant bacteria and chemical contaminants. Under Commission Implementing Regulation (EU) 2019/627, post-mortem inspection remains mandatory for all carcasses; a recent study found it was omitted based on ante-mortem findings in over 99 percent of cases, suggesting redundancies that risk-based approaches could refine rather than replace.

Future priorities, the authors conclude, include validating portable biosensors under field conditions, building multiplex platforms that detect multiple pathogens and resistance markers at once, integrating biosensor data with digital traceability systems, and training veterinary personnel in biosensor deployment — all in service of a technology-enabled One Health defense.