Bio-Rad’s dd-Check STEC Solution Receives AOAC International Approval


HERCULES, Calif.—Bio-Rad Laboratories, Inc. (NYSE: BIO and BIO.B), a global leader in life science research and clinical diagnostics products, today announced that AOAC INTERNATIONAL has approved Bio-Rad’s dd-Check STEC Solution for detecting and confirming virulence genes from Shiga toxin-producing Escherichia coli (STEC), in raw beef trim, fresh spinach and carcass sampling cloths. It is the first Droplet Digital™ PCR method approved by AOAC. The approval of the method for confirmation signifies that the dd-Check STEC Solution is comparable to the standard reference method for confirmation of STEC.

The dd-Check STEC Solution, evaluated and approved by the AOAC Performance Tested MethodsSM (PTM) Program, uses ddPCR technology to generate thousands of uniform nanoliter-sized droplets that are amplified, read, and analyzed for the colocalization of stx and eae virulence genes in a single bacterium (true positive), differentiating it from samples where virulence genes are from two different bacteria (false positive).

Brad Stawick, Senior Director of AOAC Research Institute, explained the significance of method validation: “The Performance Tested Method Program provides a rigorous third-party evaluation of test kits and other proprietary methods, ensuring that they are fit for their intended purpose and perform as claimed. This includes validation of methods based on innovative technologies, such as the recently approved Bio-Rad test kit for Shiga toxin-producing Escherichia coli (STEC) using droplet digital polymerase chain reaction (ddPCR)”

Simon May, EVP and President of Bio-Rad’s Life Science Group commented: “The dd-Check STEC assay demonstrates Bio-Rad's dedication to delivering innovative solutions for food safety testing. The rigorous and thorough standards set by AOAC validation align with our aim to provide top-tier products for our customers, and we’re proud to be playing a role in driving the transformation of STEC testing.”

dd-Check STEC Solution

To learn more about the dd-Check STEC Solution, visit

BIO-RAD and Droplet Digital are trademarks of Bio-Rad Laboratories, Inc. in certain jurisdictions.

About Bio-Rad
Bio-Rad Laboratories, Inc. (NYSE: BIO and BIO.B) is a leader in developing, manufacturing, and marketing a broad range of products for the life science research and clinical diagnostics markets. Based in Hercules, California, Bio-Rad operates a global network of research, development, manufacturing, and sales operations with over 8,000 employees and $2.7 billion in revenues in 2023. Our customers include universities, research institutions, hospitals, food safety and environmental quality laboratories, and biopharmaceutical companies. Together, we develop innovative, high-quality products that advance science and save lives. To learn more, visit

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