(144 days)
Not Found
No
The device description and performance studies describe a standard enzyme immunoassay (ELISA) for detecting specific toxins. There is no mention of AI, ML, or any computational analysis of data beyond standard assay interpretation.
No
The device is an in vitro diagnostic test for the detection of Shiga toxins, which aids in diagnosis rather than directly treating or preventing a disease.
Yes
The device is described as an "enzyme immunoassay for the simultaneous qualitative detection of Shiga toxin 1 (Stx1) and Shiga toxin 2 (Stx2)" and is "intended for use with human fecal samples from patients with gastrointestinal symptoms to aid in the diagnosis of disease". It also explicitly states "FOR IN VITRO DIAGNOSTIC USE".
No
The device description clearly outlines a physical enzyme immunoassay kit with microassay wells, antibodies, and reagents. This is a hardware-based in vitro diagnostic device, not a software-only device.
Yes, this device is an IVD (In Vitro Diagnostic).
The "Intended Use / Indications for Use" section explicitly states: "FOR IN VITRO DIAGNOSTIC USE."
Furthermore, the description of the device and its intended use aligns with the definition of an in vitro diagnostic device, as it is used to examine human specimens (fecal samples) outside of the body to aid in the diagnosis of a disease (disease caused by Shiga Toxin producing Escherichia coli).
N/A
Intended Use / Indications for Use
The SHIGA TOXIN CHEK test is an enzyme immunoassay for the simultaneous qualitative detection of Shiga toxin 1 (Stx1) and Shiga toxin 2 (Stx2) in a single test. It is intended for use with human fecal samples from patients with gastrointestinal symptoms to aid in the diagnosis of disease caused by Shiga Toxin producing Escherichia coli (STEC). It may be used directly with human fecal specimens, or broth or plate cultures derived from fecal specimens. The test results should be considered in conjunction with the patient history. FOR IN VITRO DIAGNOSTIC USE.
Product codes (comma separated list FDA assigned to the subject device)
GMZ
Device Description
The SHIGA TOXIN CHEK test uses antibodies to Stx1 and Stx2. The microassay wells supplied with the kit contain immobilized monoclonal antibodies against Stx1 and Stx2. The detecting antibody consists of a mixture of anti-Stx1 and anti-Stx2 polyclonal antibodies conjugated to horseradish peroxidase. In the assay, an aliquot of a fecal specimen or culture is emulsified in the Diluent and the diluted specimen is then transferred to the microassay well containing the detecting antibody. If Stx1 and/or Stx2 are present in the specimen, they will bind to the detecting antibody and to the immobilized monoclonal antibodies during the incubation phase. Any unbound material is removed during the washing steps. Following the addition of substrate, a color is detected due to the enzyme-antibody-antigen complexes that form in the presence of toxin.
Mentions image processing
Not Found
Mentions AI, DNN, or ML
Not Found
Input Imaging Modality
Not Found
Anatomical Site
Not Found
Indicated Patient Age Range
Not Found
Intended User / Care Setting
Not Found
Description of the training set, sample size, data source, and annotation protocol
Not Found
Description of the test set, sample size, data source, and annotation protocol
Not Found
Summary of Performance Studies (study type, sample size, AUC, MRMC, standalone performance, key results)
Clinical Performance: The performance of the SHIGA TOXIN CHEK test was evaluated at 3 independent sites.
Direct Fecal Testing: Sample size N = 913 (899 fresh and 14 frozen specimens). Comparison to Vero Cell Cytotoxin Assay (with neutralization). Results showed sensitivity of 100%, specificity of 99.9%, and overall correlation of 99.9% with the cytotoxin assay.
Broth Cultures: Sample size N = 789. Comparison to Vero Cell Cytotoxin Assay. Results showed sensitivity of 97.1%, specificity of 99.7%, and overall correlation of 99.5% with the cytotoxin assay.
Reproducibility: Evaluated using 11 coded fecal specimens at 2 independent laboratories and TECHLAB®, Inc. Tested twice a day over 5 days by multiple technicians using 2 different kit lots. Results were consistent among locations and exhibited a correlation of 100%. Samples produced expected results 100% of the time.
Analytical Sensitivity (LOD):
For direct fecal specimens: cutoff for Stx1 was 0.28 ng/mL, and for Stx2 was 0.23 ng/mL. Determined by testing dilutions in negative fecal pools in replicates of 20, yielding positive results 95% of the time.
For broth cultures: cutoff for Stx1 was 0.18 ng/mL, and for Stx2 was 0.30 ng/mL. Determined by testing dilutions in overnight GN broth culture of non-toxin producing E. Coli O157 (ATCC 043888) in replicates of 20, yielding positive results 95% of the time.
Analytical Specificity (Cross Reactivity): Evaluated with various bacterial and viral strains. None of the strains interfered with performance.
Precision - Intra-Assay: 6 positive and 6 negative fecal specimens analyzed in replicates of eight. All positives remained positive and all negatives remained negative.
Precision - Inter-Assay: 12 fecal specimens (six negative, two positive for Stx1, two positive for Stx2, and two positive for both) tested twice a day over 5 days using 2 different kit lots. All positives remained positive and all negatives remained negative.
Key Metrics (Sensitivity, Specificity, PPV, NPV, etc.)
Direct Fecal Testing:
Sensitivity: 100% (95% Confidence Limits: 94.2 - 100%)
Specificity: 99.9% (95% Confidence Limits: 99.2 - 100%)
Correlation: 99.9% (95% Confidence Limits: 100 - 100%)
Broth Cultures:
Sensitivity: 97.1% (95% Confidence Limits: 89.0 - 99.5%)
Specificity: 99.7% (95% Confidence Limits: 98.9 - 99.9%)
Correlation: 99.5% (95% Confidence Limits: 99.5 - 99.5%)
Predicate Device(s): If the device was cleared using the 510(k) pathway, identify the Predicate Device(s) K/DEN number used to claim substantial equivalence and list them here in a comma separated list exactly as they appear in the text. List the primary predicate first in the list.
Reference Device(s): Identify the Reference Device(s) K/DEN number and list them here in a comma separated list exactly as they appear in the text.
Not Found
Predetermined Change Control Plan (PCCP) - All Relevant Information for the subject device only (e.g. presence / absence, what scope was granted / cleared under the PCCP, any restrictions, etc).
Not Found
§ 866.3255
Escherichia coli serological reagents.(a)
Identification. Escherichia coli serological reagents are devices that consist of antigens and antisera used in serological tests to identifyEscherichia coli from cultured isolates derived from clinical specimens. Additionally, some of these reagents consist ofEscherichia coli antisera conjugated with a fluorescent dye used to identifyEscherichia coli directly from clinical specimens or cultured isolates derived from clinical specimens. The identification aids in the diagnosis of diseases caused by this bacterium belonging to the genusEscherichia, and provides epidemiological information on diseases caused by this microorganism. AlthoughEscherichia coli constitutes the greater part of the microorganisms found in the intestinal tract in humans and is usually nonpathogenic, those strains which are pathogenic may cause urinary tract infections or epidemic diarrheal disease, especially in children.(b)
Classification. Class I (general controls). The device is exempt from the premarket notification procedures in subpart E of part 807 of this chapter subject to the limitations in § 866.9.
0
Image /page/0/Picture/0 description: The image shows the word "TECHLAB" in bold, black letters inside of a black oval. The word is all capitalized, and there is a small dot after the "B". The oval is thin and surrounds the word closely.
OCT
2 2012
SHIGA TOXIN CHEK 510(k) SUMMARY
This summary of 510(k) safety and effectiveness is being submitted in accordance with the requirements of 21 CFR 807.92.
Applicant/Contact Information:
Date Prepared: Name: Address:
August 30, 2012 TECHLAB®, Inc. 2001 Kraft Drive Corporate Research Center Blacksburg, VA 24060
Contact Person: Phone Number: Email:
Donna T. Link 540-953-1664
Signature:
ber: 540-953-1664
dlink@techlab.com
1.1 Manufacturing Facility Address
TECHLAB®, Inc. 2001 Kraft Drive Blacksburg, VA 24060-6358
1.2 Product and Trade Name of the Device
SHIGA TOXIN CHEK
1.3 Common Name or Classification Name
E. coli toxins detection test
1.4 Classification and Regulation
Class I 21 CFR 866.3255; Escherichia coli serological reagents
1.5 Product Code(s)
GMZ - Antigens, all types, Escherichia coli
1.6 Panel
83 Microbiology
1
Intended Use
The SHIGA TOXIN CHEK test is an enzyme immunoassay for the simultaneous qualitative detection of Shiga toxin 1 (Stx1) and Shiga toxin 2 (Stx2) in a single test. It is intended for use with human fecal samples from patients with gastrointestinal symptoms to aid in the diagnosis of disease caused by Shiga Toxin producing Escherichia coli (STEC). It may be used directly with human fecal specimens, or broth or plate cultures derived from fecal specimens. The test results should be considered in conjunction with the patient history.
Explanation
Shiga toxin producing Escherichia coli (STEC) were first described by O' Brien, et al. after discovering that E. coli culture supernatant, which was cytotoxic to HeLa and Vero cells, could be neutralized by rabbit antibodies. STEC cause foodborne and waterborne diarrheal disease worldwide which, if left undiagnosed, can progress to hemorrhagic colitis and/or hemolytic uremic syndrome (HUS). Since certain treatments and medications can increase the risk of HUS, prompt detection is necessary to prevent outbreaks and secondary transmission. STEC strain O157:H7 has historically been the focus of attention in the United States since first isolated from undercooked hamburgers, causing an estimated 73,000 illnesses annually. However, STEC infections caused by non-0157 strains have become more prevalent in recent years, both in the United States as well as abroad. 0157:H7 infections are routinely diagnosed by culture of fecal samples on selective methodology allows non-O157 STEC strains to go undetected. STEC produce either one or both Shiga toxins (Stx1 and/or Stx2), both potent cytotoxins. Isolates producing only Stx2 have been attributed to higher incidence rates of HUS. Shiga toxins can be detected by tissue culture assay, but this method is both time consuming and labor intensive. By detecting the SHIGA TOXIN CHEK test can detect STEC present in fecal samples or culture, regardless of the serotype or other virulence factors.
Device Description
The SHIGA TOXIN CHEK test uses antibodies to Stx1 and Stx2. The microassay wells supplied with the kit contain immobilized monoclonal antibodies against Stx1 and Stx2. The detecting antibody consists of a mixture of anti-Stx1 and anti-Stx2 polyclonal antibodies conjugated to horseradish peroxidase. In the assay, an aliquot of a fecal specimen or culture is emulsified in the Diluent and the diluted specimen is then transferred to the microassay well containing the detecting antibody. If Stx1 and/or Stx2 are present in the specimen, they will bind to the detecting antibody and to the immobilized monoclonal antibodies during the incubation phase. Any unbound material is removed during the washing steps. Following the addition of substrate, a color is detected due to the enzyme-antibody-antigen complexes that form in the presence of toxin.
Materials Provided
Microassay Plate - 12 strips, each strip consisting of 8 wells, coated with monoclonal antibodies specific for Stx1 and Stx2 (stored with desiccant)
Diluent (40 mL) - buffered protein solution containing 0.02% thimerosal
Substrate (14 mL) - solution containing tetramethylbenzidine and peroxide
Wash Buffer Concentrate (50 mL) - 20X concentrate containing phosphate buffered saline, detergent, and 0.2% thimerosal
Stop Solution (7 mL) - 0.6N sulfuric acid
2
Positive Control (3.5 mL) - inactivated antigen in a buffered protein solution containing amphotericin B Conjugate (7 mL) – polyclonal antibodies specific for Stx1 and Stx2 coupled to horseradish peroxidase in a buffered protein solution containing 0.02% thimerosal Disposable plastic pipettes - graduated at 50 µL, 100 µL, 200 µL and 300 µL Plastic Adhesive Sheets – Quantity 2 Wash Label – Quantity 1 [IVD] In Vitro Diagnostic Medical Device
Comparative Information of Predicate Devices
| Kit Name | 510(k)
Numbers | Intended Use | Format | Target Population |
|-------------------------------------------------------------------|---------------------------------------------------------|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------|----------------------------------------------------|-----------------------------------------------|
| Vero Cell Cytotoxin
Assay (with
neutralization)* | Clinical
Reference
Standard
(gold
standard) | Detection of Shiga
toxins 1 and 2 from
fecal specimens, broth
cultures, individual
colonies or colony
sweeps of agar plates | Cell culture
cytotoxicity and
neutralization | Persons suspected of
having STEC infection |
| Premier™ EHEC | K953362 | Detection of Shiga
toxins 1 and 2 from
direct fecal samples,
broth cultures of fecal
specimens, individual
colonies or colony
sweeps of agar plates | Microwell ELISA | Persons suspected of
having STEC infection |
| ImmunoCard Stat!
EHEC | K062546 | Detection of Shiga
toxins 1 and 2 in
cultures derived from
clinical stool specimens | Immuno-
chromatographic
rapid test | Persons suspected of
having STEC infection |
| ProSpecT Shiga
Toxin E. coli (EHEC)
Microplate ELISA | K980507 | Detection of Shiga
toxins (Stx1 and Stx2)
in aqueous extracts of
fecal specimens and
broth enriched fecal
cultures | Microplate ELISA | Persons suspected of
having STEC infection |
*Comparative device used to establish equivalency.
3
| Similarities | ||||
|---|---|---|---|---|
| ltem | SHIGA TOXIN CHEK | ImmunoCard STAT! | ||
| EHEC | ||||
| K062546 | PREMIER EHEC | |||
| K953362 | ProSpecT Shiga Toxin | |||
| E. coli (STEC) | ||||
| K980507 | ||||
| Intended | ||||
| Use | Qualitative Detection of | |||
| Shiga toxins 1 and 2 | Qualitative Detection of | |||
| Shiga toxins 1 and 2 | Qualitative Detection of | |||
| Shiga toxins 1 and 2 | Qualitative Detection of | |||
| Shiga toxins 1 and 2 | ||||
| Technology | Immunoassay | Immunoassay | Immunoassay | Immunoassay |
| Antibody | ||||
| Format | Monoclonal/Polyclonal | Monoclonal/Polyclonal | Monoclonal/Polyclonal | Monoclonal/Polyclonal |
| Differences | ||||
|---|---|---|---|---|
| Item | SHIGA TOXIN | |||
| CHEK | ImmunoCard STAT! | |||
| EHEC | PREMIER EHEC | ProSpecT Shiga | ||
| Toxin E. coli (STEC) | ||||
| Intended Use | Non-differentiation | Differentiation | Non-differentiation | Non-differentiation |
| Technology | Enzyme | |||
| Immunoassay - | ||||
| Microwell Plate | ||||
| ELISA | Immunochromatographic | |||
| (lateral flow) | Enzyme Immunoassay |
- Microwell Plate
ELISA | Enzyme Immunoassay - Microwell Plate
ELISA |
| Specimen
Types | Direct Human Fecal
Specimens
Broth Cultures
Plate cultures | Broth and Plate Cultures
only | Direct Human Fecal
Specimens
Broth cultures
Plate cultures | Direct Human Fecal
Specimens
Broth cultures |
| Amount of
Specimen
required | 50 µL - fecal or broth
culture
100 µL - transport
media | 50 µL - fecal | 50 µL - fecal | 300 µL - fecal |
| Time to Result | 60 minutes or
alternate rapid 30
minutes | 25 minutes
after the 16-24 hr.
enrichment procedure | 2 hour 15 minutes | 1 hour 50 minutes |
4
Summary of Performance Data
Predicate Device Method Comparison N/A
Other Method Comparison - Clinical Reference Standard (Gold Standard)
Vero Cell Cytotoxin Assay with neutralization
Clinical Performance
The performance of the SHIGA TOXIN CHEK test was evaluated at 3 independent sites. A summary of overall performance at the 3 sites follows.
Direct Fecal Testing
The performance of the SHIGA TOXIN CHEK test was compared to the Vero Cell Cytotoxin Assay (with neutralization) and included 899 fresh and 14 frozen specimens. The following table shows a summary of the clinical performance of the SHIGA TOXIN CHEK test. The results show that the SHIGA TOXIN CHEK test exhibited a sensitivity of 100%, a specificity of 99.9%, and an overall correlation of 99.9% with the cytotoxin assay.
SHIGA TOXIN CHEK Test Versus the Vero Cell Cytotoxicity Assay
| N = 913 | Vero Cell Cytotoxicity
Assay Positive | Vero Cell Cytotoxicity
Assay Negative |
|---------------------------|------------------------------------------|------------------------------------------|
| SHIGA TOXIN CHEK Positive | 78 | 1 |
| SHIGA TOXIN CHEK Negative | 0 | 834 |
| 95% Confidence Limits | ||
|---|---|---|
| Sensitivity | 100% | 94.2 - 100% |
| Specificity | 99.9% | 99.2 - 100% |
| Correlation | 99.9% | 100 - 100% |
Broth Cultures
The performance of the SHIGA TOXIN CHEK test using overnight broth cultures (GN or MacConkey broth) from fecal specimens was compared to the Vero Cell Cytotoxin Assay. The following table shows a summary of the clinical performance of the SHIGA TOXIN CHEK test. The results show that the SHIGA TOXIN CHEK test exhibited a sensitivity of 97.1%, a specificity of 99.7%, and an overall correlation of 99.5% with the cytotoxin assay.
5
SHIGA TOXIN CHEK Test Versus the Vero Cell Cytotoxicity Assay
| N = 789 | Vero Cell Cytotoxicity
Assay Positive | Vero Cell Cytotoxicity
Assay Negative |
|---------------------------|------------------------------------------|------------------------------------------|
| SHIGA TOXIN CHEK Positive | 67 | 2 |
| SHIGA TOXIN CHEK Negative | 2 | 718 |
| 95% Confidence Limits | ||
|---|---|---|
| Sensitivity | 97.1% | 89.0 - 99.5% |
| Specificity | 99.7% | 98.9 - 99.9% |
| Correlation | 99.5% | 99.5 - 99.5% |
Reproducibility
The reproducibility of the SHIGA TOXIN CHEK test was determined using 11 fecal specimens that were coded to prevent their identification during testing. Testing was performed at 2 independent laboratories and on-site at TECHLAB®, Inc. The samples were tested, twice a day over a 5-day period by multiple technicians at each site using 2 different kit lots. A positive and negative control was run with each panel of the masked samples. The results from each
laboratory were submitted to TECHLAB®, Inc. and compared with in-house results. Th were consistent among the different locations, and exhibited a correlation of 100%. The samples produced the expected results 100% of the time.
6
Analytical Sensitivity
The cutoff for the SHIGA TOXIN CHEK test for direct fecal specimens was established at concentrations of 0.28 ng/mL Stx1 and 0.23 ng/mL Stx2, and for broth cultures at concentrations of 0.18 ng/mL Stx1 and 0.30 ng/mL Stx2.
Determination of Limitation of Detection (LOD) - cutoff points for Stx1 and Stx2 directly from fecal specimens:
The results were determined following EP17A - "Protocols for Determination of Limits of Detection and Limits of Quantitation; Approved Guideline".
The cutoff point for Stx1 was determined by using highly purified Stx1, and was defined as the concentration of toxin which vielded positive results 95% of the time, and negative results 5% of the time. The cutoff point was determined empirically by testing dilutions of Stx1 in a neqative fecal pool, in replicates of 20. Using this method, the cutoff was found to be 0.280 ng/mL. A concentration of 0.275 ng/mL was positive 50% of the time, and a concentration of 0.260 ng/mL was negative 95% of the time.
The cutoff point for Stx2 was determined by using highly purified Stx2, and was defined as the concentration of toxin which vielded positive results 95% of the time, and negative results 5% of the time. The cutoff point was determined empirically by testing dilutions of Stx2 in a negative fecal pool, in replicates of 20. Using this method, the cutoff was found to be 0.230 ng/mL. A concentration of 0.200 ng/mL was positive 50% of the time, and a concentration of 0.150 ng/mL was negative 95% of the time.
Determination of Limitation of Detection (LOD) - cutoff points for Stx1 and Stx2 from broth cultures:
The results were determined following EP17A - "Protocols for Determination of Limits of Detection and Limits of Quantitation; Approved Guideline".
The cutoff point for Stx1 was determined by using highly purified Stx1, and was defined as the concentration of toxin which yielded positive results 95% of the time, and negative results 5% of the time. The cutoff point was determined empirically by testing dilutions of Stx1 in overnight GN broth culture of non-toxin producing E. Coli O157 (ATCC 043888), in replicates of 20. Using this method, the cutoff was found to be 0.180 ng/mL. A concentration of 0.120 ng/mL was positive 50% of the time, and a concentration of 0.110 ng/mL was negative 95% of the time.
The cutoff point for Stx2 was determined by using highly purified Stx2, and was defined as the concentration of toxin which yielded positive results 95% of the time, and negative results 5% of the time. The cutoff point was determined empirically by testing dilutions of Stx2 in overnight GN broth culture of non-toxin producing E. Coli O157 (ATCC 04388), in replicates of 20. Using this method, the cutoff was found to be 0.300 ng/mL. A concentration of 0.200 ng/mL was positive 50% of the time, and a concentration of 0.170 ng/mL was negative 95% of the time.
In conclusion, the data generated for Determination of Limitation of Detection (LOD), support Package Insert claims of analytical sensitivity for direct fecal specimens was established at concentrations of 0.28 ng/mL Stx1 and 0.23 ng/mL Stx2, and for broth cultures at concentrations of 0.18 ng/mL Stx1 and 0.30 ng/mL Stx2.
7
Analytical Specificity (Cross Reactivity)
The SHIGA TOXIN CHEK test was evaluated for cross-reactivity with the bacterial and viral strains listed below. None of the strains were shown to interfere with the performance SH/GA TOXIN CHEK test.
| Aeromonas hydrophila | Campylobacter coli | Campylobacter fetus |
|---|---|---|
| Campylobacter jejuni | Candida albicans | Citrobacter freundii |
| Clostridium difficile | Clostridium perfringens | Enterobacter cloacae |
| Enterococcus faecalis | Escherichia coli (non-toxigenic) | Escherichia coli O157:H7 (non-toxigenic) |
| Escherichia coli EIEC (enteroinvasive) | Escherichia coli EPEC (enteropathogenic) | Escherichia coli ETEC (enterotoxic) |
| Escherichia fergusonii | Escherichia hermannii | Gardnerella vaginalis |
| Helicobacter pylori | Klebsiella pneumoniae | Lactobacillus acidophilus |
| Proteus vulgaris | Providencia stuartii | Pseudomonas aeruginosa |
| Pseudomonas fluorescens | Salmonella enteric serovar minnesota | Salmonella typhimurium |
| Serratia liquefacians | Shigella flexneri | Shigella sonnei |
| Staphylococcus aureus | Staphylococcus aureus (Cowan) | Staphylococcus epidermidis |
| Yersinia enterocolitica |
Human Adenovirus, Type 2, 14, 40 and 41 Human Coxsackievirus A9, B1 Feline calicvirus
Human rotavirus
Human Enterovirus 69
Strains/Serotypes
Various E. coli Shiga toxin-producing strains and serotypes were tested in the SHIGA TOXIN CHEK test by both the Sorbitol MacConkey Agar (SMAC) plate and MacConkey broth culture methods. Escherichia coli 0157 strains were also tested using CT-SMAC and ChromAgar 0157 plate cultures. Each strain is a clinical isolate and each was tested by a cytotoxin assay and by a polymerase chain reaction (PCR) to confirm the presence of the Shiga toxin gene(s). All organisms generated positive results for the appropriate toxin(s) when tested. Following is a list of the serotypes tested, the number of strains tested in that group type and the type of toxin produced by each strain.
Shiga Toxin Type Stx1: Strain Types - O26:H11 (5 strains), O157:H7, O111:NM (2 strains), 0103:H2, O103:H25, O103:H6, O103:N, O111:H11, O111:H8, O145:NM, O45:H2 (4 strains), 045:NM, 0125:NM, 0146:H21, 0156:H21, 026, 05:N, 070:H111, 0111a:NM
Shiga Toxin Type Stx2: Strain Types - 157:H7 (6 strains), O104:H4 (European 2011 outbreak strain), 0177:NM, 06:H10. 0121:H19 (3 strains), 0121. 0145:H28. 0145. 0113:H21. 0104:H21, O55:H7, O91:H21, O6:H10
Shiga Toxin Type Stx1 and Stx2: Strain Types - O157:H7 (8 strains), O157:NM (2 strains), 0111:H8, O111, O111:NM (2 strains), O113:H21, O15:H27
Interfering Substances (U.S. Formulations)
The following substances had no effect on positive or negative test results analyzed at the concentrations indicated: Hog gastric mucin (3.5% w/v), Human blood (40% v/v), Barium sulfate (5% w/v), Imodium® (5% v/v), Kaopectate® (5% v/v), Pepto-Bismol® (5% v/v), Maalox® Advanced (5% v/v), Steric Acid (40% w/v), Metronidazole (0.25% w/v), Vancomycin (0.25% w/v), Priolsec OTC® (5 µg/mL), TUMS (50 µg/mL), Tagamet® (5 µg/mL), Leukocytes (0.05% v/v), Ciprofloxacin (0.25% w/v).
8
Precision - Intra-Assay
For the determination of intra-assay performance, 6 positive fecal specimens and 6 negative fecal specimens were analyzed. Each specimen was assayed in replicates of eight. All positives remained positive and all negatives remained negative.
Precision - Inter-Assay
The inter-assay precision of the SHIGA TOXIN CHEK test was determined using 12 fecal specimens (six negative, two positive for Stx1, two positive for Stx2, and two positive for both Stx1 and Stx2). The samples were tested, twice a day over a 5-day period using 2 different kit lots. A positive and negative control was run on each day. All positives remained positive and all negatives remained negative.
Conclusion
The information submitted in this premarket notification is complete and supports a substantial equivalence decision.
9
DEPARTMENT OF HEALTH & HUMAN SERVICES
Image /page/9/Picture/1 description: The image shows the logo for the U.S. Department of Health & Human Services. The logo consists of a circular seal with the text "DEPARTMENT OF HEALTH & HUMAN SERVICES - USA" arranged around the perimeter. Inside the circle is an abstract symbol resembling an eagle or bird in flight, composed of several curved lines.
Public Health Service
Food and Drug Administration 10903 New Hampshire Avenue Silver Spring, MD 20993
TECHLAB®, Inc. c/o Donna T. Link Director of OA, Regulatory & Compliance 2001 Kraft Drive Blacksburg, VA 24060-6358
Re: K121411
Trade/Device Name: SHIGA TOXIN CHEK Regulation Number: 21 CFR 866.3255 Regulation Name: Escherichia coli serological reagents Regulatory Class: Class I Product Code: GMZ Dated: September 26, 2012 Received: September 26, 2012
OCT 2 2012
Dear Ms. Link:
We have reviewed your Section 510(k) premarket notification of intent to market the device referenced above and have determined the device is substantially equivalent (for the indications for use stated in the enclosure) to legally marketed predicate devices marketed in interstate commerce prior to May 28, 1976, the enactment date of the Medical Device Amendments, or to devices that have been reclassified in accordance with the provisions of the Federal Food, Drug, and Cosmetic Act (Act) that do not require approval of a premarket approval application (PMA). You may, therefore, market the device, subject to the general controls provisions of the Act. The general controls provisions of the Act include requirements for annual registration, listing of devices, good manufacturing practice, labeling, and prohibitions against misbranding and adulteration.
If your device is classified (see above) into class II (Special Controls), it may be subject to such additional controls. Existing major regulations affecting your device can be found in Title 21, Code of Federal Regulations (CFR), Parts 800 to 895. In addition, FDA may publish further announcements concerning your device in the Federal Register.
Please be advised that FDA's issuance of a substantial equivalence determination does not mean that FDA has made a determination that your device complies with other requirements of the Act or any Federal statutes and regulations administered by other Federal agencies. You must comply with all the Act's requirements, including, but not limited to: registration and listing (21 CFR Part 807); labeling (21 CFR Parts 801 and 809); medical device reporting of medical device-related adverse events) (21 CFR 803); and good manufacturing practice requirements as set forth in the quality systems (QS) regulation (21 CFR Part 820). This letter will allow you to begin marketing your device as described in your Section 510(k) premarket : notification. The FDA finding of substantial equivalence of your device to a legally marketed
10
Page 2 - Donna T. Link
predicate device results in a classification for your device and thus, permits your device to proceed to the market.
If you desire specific advice for your device on our labeling regulation (21 CFR Parts 801 and 809), please contact the Office of In Vitro Diagnostic Device Evaluation and Safety at (301) 796-5450. Also, please note the regulation entitled, "Misbranding by reference to premarket notification" (21 CFR Part 807.97). For questions regarding the reporting of adverse events under the MDR regulation (21 CFR Part 803), please go to
http://www.fda.gov/MedicalDevices/Safety/ReportaProblem/default.htm for the CDRH's Office of Surveillance and Biometrics/Division of Postmarket Surveillance.
You may obtain other general information on your responsibilities under the Act from the Division of Small Manufacturers, International and Consumer Assistance at its toll-free number (800) 638-2041 or (301) 796-7100 or at its Internet address http://www.fda.gov/cdrh/industry/support/index.html.
Sincerely yours,
Uve Saif ta
Sally A. Hojvat, M.Sc., Ph.D. Director Division of Microbiology Devices Office of In Vitro Diagnostics and Radiological Health Center for Devices and Radiological Health
Enclosure
11
INDICATIONS FOR USE 2.
K 121411 510(k) Number:
Device Name:
SHIGA TOXIN CHEK
Indications For Use:
The SHIGA TOXIN CHEK test is an enzyme immunoassay for the simultaneous qualitative detection of Shiga toxin 1 (Stx1) and Shiga toxin 2 (Stx2) in a single test. It is intended for use with human fecal samples from patients with gastrointestinal symptoms to aid in the diagnosis of disease caused by Shiga Toxin producing Escherichia coli (STEC). It may be used directly with human fecal specimens, or broth ronin aroutures derived from fecal specimens. The test results should be considered in conjunction with the patient history.
FOR IN VITRO DIAGNOSTIC USE.
Prescription Use (Part 21 CFR 801 Subpart D) AND/OR
Over-The-Counter Use (21 CFR 807 Subpart C)
(Please Do Not WRITE BELOW THIS LINE-CONTINUE ON ANOTHER PAGE IF NEEDED)
Concurrence of CDRH, Office of In Vitro Diagnostic Devices (OIVD)
Page 1 of _ 1
Ritha Shearer
Division Sign-off Office of In Vitro Diagnostic Device Evaluation and Safety
510(k) K121411
Page 1 of