PCR / qPCR Testing (Pathogen-Specific Gene Targets)

Rapid Molecular Detection for Food, Water, and Environmental Safety 

Foodborne and waterborne pathogens remain a major global public health challenge, requiring fast, sensitive, and reliable detection methods. Traditional culture-based techniques are often slow and may fail to detect low-level or stressed organisms. PCR (Polymerase Chain Reaction) and qPCR (Real-Time PCR) provide a powerful molecular solution by detecting pathogenspecific genetic targets with high accuracy and speed. 

At METS Laboratory, we perform PCR and RT-qPCR testing using validated pathogenspecific gene targets, enabling precise identification of bacterial, viral, and parasitic organisms in food, water, and environmental samples. 

What Is PCR / qPCR Testing? 

PCR is a molecular technique that amplifies specific DNA sequences, allowing even trace amounts of pathogens to be detected. qPCR (real-time PCR) enhances this process by enabling real-time monitoring and quantification of amplified genetic material. 

Together, these technologies provide: 

• High sensitivity for low-level contamination 
• High specificity through gene-target detection 
• Rapid turnaround time compared to conventional methods 
• Reliable results for regulatory compliance and food safety decisions 

Viral Pathogen Detection (RT-qPCR) 

Hepatitis A Virus (HAV) 

Hepatitis A virus (HAV) is a non-enveloped, single-stranded RNA virus responsible for acute viral liver disease transmitted mainly via the fecal–oral route. Infection occurs through personto-person contact or consumption of contaminated food and water. 

Clinical severity ranges from mild illness to severe hepatitis, with rare cases of fulminant liver failure. Disease severity generally increases with age. 

Key characteristics of HAV include: 

• Transmission through contaminated food and water
• Resistance to environmental conditions 
• Persistence on food surfaces 
• Ability to withstand common food-processing conditions 

Although an effective vaccine exists, there is no specific antiviral treatment, making prevention through food and water safety critical. 

Norovirus Genogroup I (NoV GI) 

Human noroviruses are among the leading causes of gastroenteritis outbreaks worldwide. They are highly infectious, with an extremely low infectious dose of only 1–10 viral particles, making them highly efficient in outbreak scenarios. 

Noroviruses are transmitted primarily via the fecal–oral route through: 

• Contaminated food and water 
• Contaminated surfaces 
• Direct person-to-person contact 

They are highly stable in the environment and resistant to many physical and chemical treatments used in food processing. 

Norovirus Genogroup I (NoV GI): 

• Belongs to the Caliciviridae family 
• Is a non-enveloped, single-stranded RNA virus 
• Is one of the major genogroups responsible for human infections (GI and GII) 

1. Detection Approach

At METS Laboratory, detection of HAV and NoV GI is performed using RT-qPCR (reverse transcription real-time PCR), which targets viral RNA after conversion into complementary DNA (cDNA). 

For norovirus testing, sample types may include: 

• Soft fruits 
• Leafy, stem, and bulb vegetables 
• Bottled water 
• Bivalve molluscan shellfish 
• Food contact surfaces 

A viral concentration step is often required prior to RNA extraction to improve detection sensitivity. 

Bacterial Pathogen Detection 

Salmonella spp. 

Salmonella is one of the most significant foodborne pathogens globally and is associated with a wide range of food products, including poultry, eggs, meat, and processed foods. 

At METS Laboratory, detection is performed using real-time PCR targeting specific DNA sequences, enabling rapid identification after enrichment. The method supports early detection and helps prevent contaminated products from entering the food supply chain. 

Escherichia coli O157:H7 

E. coli O157:H7 is a highly pathogenic strain associated with severe gastrointestinal illness, including hemorrhagic colitis and hemolytic uremic syndrome (HUS). 

PCR-based detection enables: 

• Rapid identification of contamination 
• High sensitivity in food and environmental samples 
• Reliable confirmation following enrichment 

Campylobacter spp. 

Campylobacter species are among the most common causes of bacterial gastroenteritis worldwide. Infection is commonly linked to poultry, raw milk, and contaminated water. 

PCR/qPCR testing provides rapid detection, improving response time in food safety monitoring programs. 

Clostridium botulinum 

Clostridium botulinum is a spore-forming bacterium that produces one of the most potent neurotoxins known. It is associated with: 

• Improperly processed canned foods 
• Vacuum-packed foods 
• Seafood products 
• Honey (infant botulism risk) 

PCR-based detection targets toxin-associated genes to identify potential risk strains, supporting early intervention and prevention of foodborne botulism. 

Waterborne Parasite Detection 

Water safety is a critical component of food safety and public health. PCR/qPCR enables sensitive detection of protozoan parasites that may persist in water systems and food processing environments. 

METS Laboratory performs molecular detection of: •        Entamoeba histolytica 

• Giardia spp. 
• Cryptosporidium spp. 

These organisms are resistant to environmental stress and can survive standard water treatment processes, making molecular detection essential for monitoring and control. 

Advantages of PCR / qPCR Testing 

PCR-based pathogen detection offers several key advantages over conventional methods: 

• Rapid results (hours instead of days) 
• High analytical sensitivity 
• Specific detection of pathogenic gene targets 
• Ability to detect non-culturable organisms 
• Early outbreak detection and response 
• Improved food safety decision-making 

The Science Behind PCR / qPCR Testing 

METS Laboratory follows a structured molecular workflow: 

• Sample Preparation 

Food, water, or environmental samples are processed under controlled conditions. 

• Nucleic Acid Extraction 

DNA or RNA is extracted using validated laboratory methods. 

• Amplification of Target Genes 

Pathogen-specific genetic markers are amplified using PCR or RT-qPCR. 

• Real-Time Detection 

Fluorescent signals are monitored to detect presence and quantity of target organisms. 

• Data Analysis and Reporting 

Results are interpreted by molecular specialists and delivered in clear, actionable reports. 

Why Choose METS Laboratory? 

METS Laboratory provides advanced molecular testing solutions for food safety, water quality, and environmental monitoring. 

Our capabilities include: 

• Viral RT-qPCR testing (HAV, Norovirus GI) 
• Bacterial pathogen detection (Salmonella, E. coli O157:H7, Campylobacter, C. botulinum) 
• Waterborne parasite detection 
• High-sensitivity PCR/qPCR workflows 
• Fast turnaround and reliable reporting 
• Expert scientific interpretation 

Strengthening Safety Through Molecular Precision 

PCR and qPCR testing represent the gold standard for rapid pathogen detection. By targeting specific genetic sequences, METS Laboratory delivers accurate, timely, and reliable results that support food safety assurance, outbreak prevention, and public health protection. 

Through molecular diagnostics, we help ensure safer food and water systems—protecting consumers from farm to fork and source to tap.