Meat Testing
Testing Meat for Pathogenic Bacteria and Animal Diseases in Mexico
Pathogen testing checks raw or processed meat for bacteria that cause foodborne illness and supports the official campaigns against animal diseases such as bovine tuberculosis and brucellosis.
Foodborne bacteria
Mexico's reference microbiological methods are in NOM-210-SSA1-2014 (Salmonella, Staphylococcus aureus, Listeria monocytogenes, coliforms and E. coli, Vibrio). NOM-213-SSA1-2018 sets microbiological specifications for processed meats, NOM-194-SSA1-2004 for slaughter and sale of fresh meat, and NOM-251-SSA1-2009 the hygiene practices that kitchens and processors must follow.
Indicator organisms (aerobic plate count, total coliforms, E. coli) tell you about hygiene and cold chain; pathogens (Salmonella, Listeria, STEC) are presence/absence tests usually reported per 25 g. Rapid PCR screens can give a negative in 24-48 hours, while culture confirmation takes 3-7 days.
- Salmonella spp.: poultry, pork and ground meat
- E. coli O157:H7 and other STEC: ground beef and raw beef dishes
- Listeria monocytogenes: ready-to-eat and cooked cured meats
- Campylobacter: raw poultry
- Staphylococcus aureus: handling contamination in cooked products
Animal diseases: bovine TB and brucellosis
Bovine tuberculosis (NOM-031-ZOO-1995) and brucellosis (NOM-041-ZOO-1995) are controlled through national campaigns. In slaughterhouses, lesions suggestive of TB (granulomas) are submitted to SENASICA-authorized diagnostic labs; SENASICA reports list the Laboratorio Central Regional de Mérida among them. Live-animal testing is done by authorized veterinarians (tuberculin test, card and other serology for Brucella).
Sampling and shipping
Send 200-250 g of meat (500 g whole fish) in a sterile bag, chilled at 2-8 °C, arriving within 24 hours; do not freeze samples for pathogen testing unless the lab agrees. The Quintana Roo state lab accepts raw mammal and poultry meat, cooked and raw sausages and fish for Salmonella and Listeria and reports in 10 business days.
What it costs
Published prices for Salmonella by the NOM-210 culture method range from MXN 408 (LESP Quintana Roo, 2025 catalog) to 572 (2023), 679 + IVA (Bufete Químico) and 1,001 (LIAQSA, León, 2025). Listeria costs MXN 633 at the Quintana Roo state lab and 1,730 + IVA at Bufete Químico. STEC and Campylobacter prices are not published by the labs we checked, so we give estimates.
Common tests & typical costs
| Test | Method | Cost (MXN) | Turnaround |
|---|---|---|---|
| Salmonella spp. (presence/absence in 25 g) Main pathogen in poultry, pork and ground meat. | Culture, NOM-210-SSA1-2014 Appendix A | $408–$1,001 | 5-10 days |
| Listeria monocytogenes Key risk in ready-to-eat and cured meats. | Culture, NOM-210-SSA1-2014 Appendix C | $633–$1,730 | 5-10 days |
| E. coli O157:H7 / STEC Shiga-toxin E. coli in raw or undercooked beef. | Real-time PCR screen + culture confirmation | $1,000–$3,500* | 2-7 days |
| Coliforms and E. coli (MPN) Hygiene and fecal contamination indicators. | MPN, NOM-210-SSA1-2014 Appendix H | $198–$980 | 3-10 days |
| Aerobic plate count (mesophiles) General bacterial load; cold-chain and shelf-life indicator. | Plate count, NOM-092-SSA1-1994 | $229–$447 | 3-10 days |
| Staphylococcus aureus Handling contamination; toxin risk in cooked foods. | Culture, NOM-210-SSA1-2014 Appendix B | $655–$680 | 5-10 days |
| Campylobacter spp. Common in raw poultry; needs special microaerobic culture. | Culture (ISO 10272) or PCR | $800–$2,500* | 3-7 days |
| Bovine TB: granulomatous lesion diagnosis Histopathology, culture or PCR of lesions found at slaughter. | Histopathology, culture, PCR | $500–$3,000* | 7-60 days |
| Brucella spp. (serology in live animals; PCR in dairy) Campaign test for herds; QRoo state lab runs Brucella PCR in raw dairy for MXN 688. | Card test / ELISA; real-time PCR | $50–$688* | 1-8 days |
* Estimated range. Always request a written quote from the lab.
Mexican regulations
- NOM-210-SSA1-2014: Microbiological test methods: indicator organisms and pathogens
- NOM-213-SSA1-2018: Processed meat products: sanitary specifications and test methods
- NOM-194-SSA1-2004: Sanitary specifications for slaughter, storage, transport and sale of meat
- NOM-251-SSA1-2009: Hygiene practices for processing food, beverages and supplements
- NOM-031-ZOO-1995: National campaign against bovine tuberculosis (Mycobacterium bovis)
- NOM-041-ZOO-1995: National campaign against brucellosis in animals
Where to get it tested
Runs TIF inspection, the national toxic-residue monitoring program, animal-disease campaigns and the clenbuterol-free Reliable Supplier program. Its directory of official, approved and authorized labs tells you where program samples can go.
National; state offices in Yucatán and Quintana Roo · Federal authority
National reference lab for animal-disease diagnosis and verification of veterinary biologicals.
Mexico (national reference) · SENASICA official laboratory
Binational commission with high-biosafety labs that diagnose exotic diseases such as foot-and-mouth disease and African swine fever. Contact only through SENASICA when an exotic disease is suspected.
Mexico (BSL-3 facility) · SENASICA official laboratory
Listed in SENASICA bovine-tuberculosis reports (2019-2023) among diagnostic labs processing granulomatous lesion samples from slaughter. Confirm current authorization and services before sending.
Mérida, Yucatán · SENASICA authorized diagnostic lab (per 2019-2023 reports)
COFEPRIS's national reference lab; it sets the CCAYAC methods and authorizes third-party labs (terceros autorizados). Use its list to find authorized labs whose results COFEPRIS accepts.
Mexico City (national reference) · Federal reference laboratory
Accepts private clients; publishes a service catalog (rev. 6, Nov 2025) with prices: Salmonella MXN 408, Listeria 633, molds/yeasts 229, histamine 3,031, hepatitis A RT-PCR 3,500, Gnathostoma 220. Samples Mon-Fri 8:30-13:30; quotes by email (lespqroo@hotmail.com). Turnaround: 10 business days microbiology, 8 PCR, 25 toxicology.
Av. Maxuxac s/n con Calle Miguel Alemán, Fracc. Residencial Chetumal, C.P. 77039, Chetumal, Quintana Roo · COFEPRIS third-party authorized lab; quality system under NMX-EC-17025-IMNC-2018
State public health lab of the Federal Sanitary System; analyzes food and water for state surveillance. Ask the Servicios de Salud de Yucatán whether it accepts private samples and for its current fees, which were not published online when we checked.
Mérida, Yucatán
- FMVZ-UADY (Facultad de Medicina Veterinaria y Zootecnia, Universidad Autónoma de Yucatán) University
The region's veterinary school (founded 1970). We could not find a published service catalog or prices; contact the faculty directly to ask about parasitology, microbiology or nutrition analyses for producers.
Km 15.5 carretera Mérida-Xmatkuil, Mérida, Yucatán
Public research center offering food microbiology (including PCR for Salmonella and Listeria), physicochemical and residue analyses. Its online catalog was under maintenance when checked; request a quote.
Av. Normalistas 800, Colinas de la Normal, Guadalajara, Jalisco (plus other units)
- CIAD – Laboratorio de Inocuidad Alimentaria University
Public research center with a food-safety lab and a coordination for animal-origin food technology (meat quality research). Contact for services.
Hermosillo, Sonora
- SGS de México – food laboratory Private
Food lab offering microbiology (including Salmonella and Listeria by PCR), proximate/nutrition-label analyses and trace metals. Received COFEPRIS authorization in 2024. Prices on quote.
Naucalpan, Estado de México · ema ISO/IEC 17025:2018; COFEPRIS authorization (2024)
- Mérieux NutriSciences México Private
International food-testing group (formerly Silliker in Mexico) offering microbiology, chemistry, labeling and audits. It agreed in 2024 to acquire Bureau Veritas' global food-testing business. Prices on quote.
Labs reported in Querétaro, Guadalajara and Mexico City
- Bufete Químico, S.A. de C.V. Private
Publishes a full tariff (prices + IVA, 10-day service, MXN 561 sampling visit): Salmonella 679, Listeria 1,730, S. aureus 655, molds/yeasts 457, protein 749, fatty acids 2,843, metals 803-808, aflatoxins 2,225, nitrites 1,236. Accreditation 22LEC005 was listed valid to 04/08/2026; confirm renewal.
Dr. Atl 286, Col. Santa María la Ribera, Cuauhtémoc, CDMX · ema / MAAC (22LEC005)
Closest ema-accredited private food lab found on the Peninsula with published prices; its 2023 food list includes coliforms and E. coli (NOM-210 Appendix H) and food sampling, about MXN 300-360 per test with IVA.
Acción Nacional s/n, Col. Ampliación Polvorín II, C.P. 24060, San Francisco de Campeche, Campeche · ema A-1080-102/19 (food)
Publishes 2025 food microbiology prices, e.g. Salmonella MXN 1,001.30 and aerobic plate count 447.30; useful as a recent national benchmark.
León, Guanajuato · ema A-033-005/09
Frequently Asked Questions
Which test should a restaurant run on a new beef supplier?
Start with aerobic plate count, E. coli and Salmonella on ground beef, and add STEC/E. coli O157:H7 if you serve rare burgers, tartare or carpaccio.
Can I freeze the sample?
For pathogens, ship chilled (2-8 °C) and fast; freezing can reduce bacterial counts. Some labs accept frozen product if it was sold frozen.
Is bovine TB a risk in meat?
Carcasses with TB lesions are detected at inspection and condemned or treated according to the inspection rules; buying from TIF or inspected plants and pasteurized dairy is the main protection.