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Salmonella control remains one of the most persistent challenges in poultry processing, not because detection methods are lacking, but because results often arrive too late to influence operational decisions. As supply chains accelerate and become increasingly decentralised, laboratory-based testing struggles to keep pace. Drawing on recent research at University Mohammed VI Polytechnic, Abdeladim Moumen, director of R&D in medical biotechnology, examines how rapid molecular screening methods could support earlier intervention and more effective risk management across the poultry value chain.

For many years, culture methods and polymerase chain reaction (PCR) have formed the backbone of Salmonella testing.

Culture testing works by isolating and growing bacteria from poultry samples under controlled laboratory conditions to confirm whether Salmonella is present. Because it identifies live bacteria, it remains the regulatory standard in many markets and is widely regarded as highly reliable.

PCR, however, takes a different approach. Instead of growing bacteria, it detects the genetic material of Salmonella by amplifying specific DNA sequences associated with the pathogen. This allows results to be produced more quickly than conventional culture testing and has made PCR an important tool in modern food safety programmes.

Both methods remain essential for regulatory compliance and routine monitoring. Their main limitation is turnaround time. Standard workflows can still take several days because enrichment and sample preparation stages are difficult to shorten. In poultry processing, where production cycles move rapidly, that delay reduces the practical value of testing. By the time results are available, products may already have moved through the supply chain. In many cases, testing confirms contamination after the fact rather than helping processors prevent it.

A system built around centralised testing

Food safety systems have traditionally been designed around central laboratory infrastructure. For large integrated processors, this model can function effectively. Across much of the poultry sector, however, production and processing are spread across multiple sites, including smaller slaughter facilities and regional plants.

In these environments, reliance on laboratory testing introduces practical constraints. Transport of samples, turnaround times and cost all influence how often testing can be carried out. As a result, testing coverage may reflect logistical limits rather than actual risk.

This creates a gap between where food safety risks occur and where they are detected. Closing that gap requires tools that can support decision-making closer to production, rather than relying entirely on centralised laboratory workflows.

A more practical approach to molecular testing

Loop-mediated isothermal amplification, or LAMP, has emerged as a faster alternative to conventional PCR. Unlike PCR, it operates at a constant temperature, simplifying the instrumentation required and allowing amplification to be completed in less than an hour. These features have made LAMP attractive for food safety applications where speed is critical.

In practice, however, most LAMP-based assays used for Salmonella detection still depend on pre-enrichment steps. Incubation periods ranging from several hours to a full day are commonly required to increase bacterial numbers and ensure reliable detection. While effective, this limits the practical advantage of the method and keeps testing firmly tied to laboratory workflows.

Recent research has focused on overcoming this limitation by removing enrichment altogether. Work carried out at University Mohammed VI Polytechnic has demonstrated that colour-based LAMP assays can be adapted to detect Salmonella directly in poultry samples without prior enrichment. The approach combines targeted assay design with simplified sample treatment, allowing bacterial DNA to be released through controlled heat treatment rather than full DNA extraction.

A key element of this strategy is the use of an in-house colourimetric buffer containing Phenol Red. During amplification, changes in pH trigger a clear visual colour shift, providing an immediate indication of a positive result without the need for specialised reading equipment. By stabilising samples before analysis, the assay remains robust despite natural variation in poultry meat.

The results of this colourimetric LAMP (cLAMP) assay offer clear visual outcomes in around 40 minutes, while maintaining sensitivity suitable for operational decision making. Crucially, this performance is achieved without enrichment or laboratory-intensive preparation steps, making the method more compatible with use outside centralised testing facilities.

Designing tests for real processing conditions

Applying rapid molecular testing to food production presents practical challenges. Poultry meat varies in composition, including fat content and acidity, all of which can affect test performance if not properly managed.

Extraction-free approaches aim to simplify preparation without removing it entirely. Basic heat or chemical treatments can release bacterial DNA in a controlled way, allowing consistent amplification without extensive laboratory processing.

The goal is not to replace laboratory systems in production facilities, but to provide screening tools that are stable enough to function in real operating conditions where time and resources are limited.

What faster screening could change

The main value of same-day screening is the ability to act sooner. Rapid testing allows processors to assess incoming raw material, verify hygiene controls during production, and, as such, investigate potential contamination before products leave the site.

Earlier detection can also help limit the scale of recalls and reduce operational disruption if contamination occurs. For regulators, rapid screening may support more targeted oversight, particularly in regions where routine laboratory testing is difficult to maintain consistently.

Accessibility is another important factor. Testing methods that can be used closer to farms or processing lines reduce dependence on sample transport and support more consistent monitoring across distributed supply chains.

Working alongside existing methods

Culture testing and PCR will continue to play a central role in food safety management, particularly for confirmation and regulatory enforcement. Their reliability and legal standing are well established.

Rapid molecular screening serves a different purpose. It provides an earlier indication of risk and supports faster operational decisions. Used alongside laboratory testing, it can help close the gap between detection and response. This combined approach reflects how food safety is managed in practice, balancing formal verification with tools that support day-to-day process control.

A more responsive model for Salmonella control

Food safety systems work best when they reflect the realities of modern production and distribution. As poultry supply chains become more complex, the ability to identify contamination earlier becomes increasingly important.

Rapid screening technologies adapted for field and processing environments show how diagnostics are evolving to meet those demands. For poultry processors, they offer a practical way to strengthen control measures without adding unnecessary operational burden.

The future of Salmonella management is unlikely to depend on a single testing method. Instead, progress will come from combining established laboratory techniques with faster screening tools that can be used where they provide the greatest operational value.