Violet-blue light must prove itself on carcasses before it becomes a poultry intervention

Low-power violet-blue light could become an additional intervention for reducing Campylobacter in the poultry chain. Researchers at the University of Reading and the Animal and Plant Health Agency tested violet-blue photodynamic inactivation (VB-PDI) against 64 isolates from British poultry surveillance. According to the university, every strain responded to treatment, including antibiotic-resistant isolates.

The process uses visible light to activate molecules already present in bacterial cells. This generates reactive oxygen species that damage and ultimately inactivate the bacteria. The approach requires neither an added photosensitiser nor physical contact with the food. In repeated tests with one strain, the authors also found no increased tolerance after 15 exposure rounds.

That does not yet amount to approval for plant use or proof of commercial efficacy on naturally contaminated carcasses. This is precisely the next step: irradiation must be validated on real surfaces, accounting for carcass geometry, organic load, line speed and sensory-quality limits. For abattoirs, the interest is not in replacing hygiene, careful evisceration or chilling, but in adding a verifiable barrier without introducing new chemical residues.

The technical relevance lies in the breadth of activity. A process measure that also reaches antimicrobial-resistant isolates could reduce reliance on individual chemical interventions. Its operational value, however, will depend on dose, exposure uniformity, occupational safety and consistent evidence that microbial reductions are retained from carcass through chilled product.