Shiga Toxin-Producing E. coli (STEC) Testing Services

Shiga toxin-producing Escherichia coli (STEC) is a group of pathogenic E. coli capable of producing potent cytotoxins known as Shiga toxins (Stx). The most notorious member of this family is E. coli O157:H7, but the group also encompasses several non-O157 serotypes that have caused major global outbreaks (such as O26, O45, O103, O111, O121, and O145, commonly referred to as the "Big Six").

STEC strains are major foodborne pathogens. They are frequently transmitted through contaminated food (e.g., undercooked ground beef, raw milk, contaminated fresh produce) and water sources. Human infections present with a wide spectrum of clinical symptoms, ranging from mild diarrhea and hemorrhagic colitis to life-threatening Hemolytic Uremic Syndrome (HUS).

In food safety monitoring, outbreak tracing, diagnostic method research, and public health emergency response, establishing a rapid, accurate, and reliable STEC testing system is absolutely critical. The core of STEC testing lies not only in confirming the serotype of the target strain but, more importantly, in defining its virulence characteristics (i.e., verifying the production of Shiga toxins).

Our Services

Relying on advanced microbiological and immunological analysis platforms, we offer multi-dimensional detection, isolation, and identification services for STEC. Tailored to the turnaround time and precision requirements of different application scenarios, we provide the following core methodologies:

• Enzyme-Linked Immunosorbent Assay (ELISA):
  • Technical Features: Utilizes rigorously validated commercial kits for high-throughput microplate testing.
  • Service Details: Direct detection of Shiga toxins (Stx1/Stx2) or specific O antigens (e.g., the O157 antigen) in enriched samples or purified isolates. Ideal for precise, high-volume sample screening and semi-quantitative analysis of toxin expression levels.
• Lateral Flow Assay (Rapid Screening):
  • Technical Features: Extremely simple operation with rapid turnaround times.
  • Service Details: Uses immunochromatographic test strips to quickly detect Stx toxins or specific serotype antigens in a sample. Perfectly suited for on-site environmental monitoring in food processing facilities, rapid preliminary screening of raw materials before intake, and immediate field responses during public health emergencies.
• Immunomagnetic Separation (IMS) Pre-treatment:
  • Technical Features: Utilizes magnetic beads coated with specific antibodies to act like "magnets," specifically capturing and extracting target bacteria from complex matrices.
  • Service Details: Serving as a critical sample pre-treatment step, IMS efficiently enriches and isolates specific STEC serotypes (especially O157:H7). By concentrating the sample via IMS prior to downstream culture, ELISA, or nucleic acid testing, the detection sensitivity for extremely low-concentration samples can be exponentially increased.

Our Advantages

• Dual Identification System: Combining "serotype surface antigen detection" with "Shiga toxin expression verification" ensures that virulence traits are not overlooked by merely detecting the bacteria itself, leaving no potential pathogenic risks unchecked.
• Perfect Balance of Speed and Sensitivity: From lateral flow strips that deliver results in 15-30 minutes on-site, to IMS technology capable of enriching trace pathogens from highly complex food matrices (like minced meat or raw milk), we cover every depth of testing requirement.
• Comprehensive Core Serotype Coverage: Our testing panels cover not only the high-risk O157:H7 but also support the targeted screening of key non-O157 serotypes (e.g., O26, O103), fully complying with the latest international food safety and regulatory standards.

In the battle against the threat of pathogenic E. coli, rapid and precise etiological identification is the first line of defense for safeguarding health and safety. Contact our technical experts today to customize your exclusive STEC testing plan, and let our professional analytical platforms protect your operations!