Salmonella testing is the microbiological examination of food, animal feed, water, and environmental samples for the presence of Salmonella spp. — Gram-negative, facultatively anaerobic bacteria responsible for one of the most common foodborne illnesses globally (salmonellosis). Because even a single cell in a tested portion can constitute a failure, the food safety criterion under EU law is absence in 25 g of product.
Key facts about Salmonella contamination:
- Over 2,500 serotypes of Salmonella enterica are known; the most common food-relevant serotypes include S. Typhimurium and S. Enteritidis.
- High-risk food categories include raw poultry, eggs, raw meat, sprouted seeds, and unpasteurised dairy products.
- Salmonella can survive in low water-activity environments (dried spices, chocolate, peanut butter) for extended periods.
- Testing is performed according to microbiological analysis protocols at Ovalab’s ISO/IEC 17025-accredited laboratory.
Detection Methods
Two main approaches are used for Salmonella detection in food laboratories:
- Culture-based method (EN ISO 6579-1:2017): The internationally recognised horizontal method. It involves pre-enrichment in buffered peptone water (BPW), selective enrichment in MSRV or RVS broth, plating on selective agar, and biochemical/serological confirmation. The full procedure typically takes 4–5 working days.
- Real-time PCR (qPCR): Molecular method targeting specific genetic loci unique to Salmonella (e.g., the ttrRSBCA locus or invA gene). PCR-validated kits deliver results in 24–48 hours. Learn more about PCR methodology.
- Immunoassay-based rapid tests: Lateral flow and ELISA-based screening tools used as presumptive tests, always confirmed by culture or PCR before reporting.
At Ovalab, Salmonella testing is performed within our accredited microbiological analysis service, combining culture methods and molecular confirmation to ensure reliable, legally defensible results.
Regulatory Framework
Salmonella testing in the EU is governed by a comprehensive regulatory framework:
- Commission Regulation (EC) No 2073/2005 on microbiological criteria for foodstuffs: Establishes food safety criteria requiring Salmonella spp. to be absent in 25 g for ready-to-eat foods, minced meat, poultry products, and many other categories.
- EN ISO 6579-1:2017 (with Amendment 1:2020): The reference standard for horizontal detection of Salmonella spp. in the food chain, covering products intended for human consumption, animal feeding, and environmental samples in food production.
- Regulation (EC) No 852/2004 on the hygiene of foodstuffs: Requires food business operators to implement HACCP-based procedures including regular microbiological testing.
- Regulation (EC) No 853/2004: Specific hygiene rules for food of animal origin, with dedicated Salmonella criteria for poultry and eggs.
Process hygiene criteria (applicable during processing) differ from food safety criteria (applied to finished products placed on the market). Exceeding a process hygiene criterion triggers corrective action; a food safety criterion failure requires product withdrawal.
Frequently Asked Questions
When is Salmonella testing required by EU law?
Under Commission Regulation (EC) No 2073/2005, the food safety criterion for Salmonella spp. is absence in 25 g for most ready-to-eat (RTE) food categories, including minced meat, poultry meat preparations, and sprouted seeds. This zero-tolerance standard reflects the pathogen’s significant public health risk — even low numbers of Salmonella can cause illness in healthy individuals.
How long does a standard Salmonella test take?
The standard culture method following EN ISO 6579-1:2017 requires 4–5 working days to complete, including pre-enrichment, selective enrichment, plating, and confirmation steps. PCR-based rapid methods can deliver presumptive results within 24–48 hours after an initial enrichment step, significantly accelerating decisions in production environments.
What is the difference between detection and enumeration?
Salmonella testing is required or strongly recommended for: raw and cooked poultry products, eggs and egg products, raw minced meat and meat preparations, ready-to-eat products, sprouted seeds, spices and dried herbs, infant formula, chocolate and confectionery, and peanut products. Environmental monitoring of food production facilities also forms a critical part of Salmonella control programmes.
Which foods are most at risk for Salmonella?
Food safety criteria apply to finished products placed on the market and define whether a food is safe for consumption (e.g., Salmonella absent in 25 g in RTE products). Process hygiene criteria indicate the acceptable functioning of the production process and apply during or after processing. Exceeding a process hygiene criterion triggers corrective action — unlike a food safety criterion failure, which requires product withdrawal and may involve regulatory notification.
Can PCR replace culture methods for Salmonella?
Results from an ISO/IEC 17025-accredited laboratory carry full legal validity for regulatory compliance, export certification, and due diligence defence. Accreditation — such as Ovalab’s Certificate No. 537/2025 from the Czech Accreditation Institute — ensures validated methods, competent staff, calibrated equipment, and technically sound results. Non-accredited results may not be accepted by food authorities or trading partners in cases of product withdrawal or legal disputes.