K982429 · Zymetx, Inc. · PSZ · Aug 25, 1998 · Microbiology
Device Facts
Record ID
K982429
Device Name
ZSTATFLU TEST FOR INFLUENZA TYPES A AND B VIRUSES
Applicant
Zymetx, Inc.
Product Code
PSZ · Microbiology
Decision Date
Aug 25, 1998
Decision
SESE
Submission Type
Traditional
Regulation
21 CFR 866.3328
Device Class
Class 2
Indications for Use
The ZstatFlu® Test for Influenza Type A and B Viruses is an endogenous viral-encoded enzyme assay (EVEA) and is intended for use in the qualitative determination of influenza types A and B from throat swab specimens. The ZstatFlu® Test for Influenza Type A and B Viruses is not intended for the detection of influenza C. This test is indicated for the direct testing of patients presenting with influenza-like illnesses.
Device Story
The ZstatFlu® Test is an endogenous viral-encoded enzyme assay (EVEA) for qualitative detection of influenza A and B. Input: throat swab specimens. Principle: viral neuraminidase on influenza surface glycoproteins hydrolyzes a modified N-acetylneuraminic acid (Neu5Ac) substrate coupled to a chromogen; cleavage releases free chromogen which precipitates as a blue color; precipitate is concentrated on a filter device. Used in physician offices, clinics, laboratories, and hospitals; operated by physicians, nurses, or technicians. Output: visual blue precipitate indicating presence of influenza A or B. Results assist clinicians in diagnosing influenza-like illnesses.
Clinical Evidence
Clinical study conducted at seven U.S. sites during the 1995-96 season with 157 throat swab specimens. Comparator: viral isolation and culture confirmation with monoclonal antibodies. Results: Sensitivity for influenza A and B combined was 62.2% (51/82); specificity was 98.7% (74/75). Influenza A sensitivity 65.3% (32/49), specificity 99.1% (107/108). Influenza B sensitivity 57.6% (19/33), specificity 99.2% (123/124). Reproducibility testing showed 100% correlation across various clinical settings.
Technological Characteristics
Endogenous viral-encoded enzyme assay (EVEA). Employs a modified Neu5Ac molecule coupled to a chromogen as a substrate for viral neuraminidase. Detection method involves visual observation of blue precipitate collected on a filter device. Manual, point-of-care diagnostic test.
Indications for Use
Indicated for patients presenting with influenza-like illnesses for the qualitative detection of influenza types A and B from throat swab specimens. Not indicated for influenza C detection.
Regulatory Classification
Identification
An influenza virus antigen detection test system is a device intended for the qualitative detection of influenza viral antigens directly from clinical specimens in patients with signs and symptoms of respiratory infection. The test aids in the diagnosis of influenza infection and provides epidemiological information on influenza. Due to the propensity of the virus to mutate, new strains emerge over time which may potentially affect the performance of these devices. Because influenza is highly contagious and may lead to an acute respiratory tract infection causing severe illness and even death, the accuracy of these devices has serious public health implications.
Special Controls
*Classification.* Class II (special controls). The special controls for this device are:(1) The device's sensitivity and specificity performance characteristics or positive percent agreement and negative percent agreement, for each specimen type claimed in the intended use of the device, must meet one of the following two minimum clinical performance criteria:
(i) For devices evaluated as compared to an FDA-cleared nucleic acid based-test or other currently appropriate and FDA accepted comparator method other than correctly performed viral culture method:
(A) The positive percent agreement estimate for the device when testing for influenza A and influenza B must be at the point estimate of at least 80 percent with a lower bound of the 95 percent confidence interval that is greater than or equal to 70 percent.
(B) The negative percent agreement estimate for the device when testing for influenza A and influenza B must be at the point estimate of at least 95 percent with a lower bound of the 95 percent confidence interval that is greater than or equal to 90 percent.
(ii) For devices evaluated as compared to correctly performed viral culture method as the comparator method:
(A) The sensitivity estimate for the device when testing for influenza A must be at the point estimate of at least 90 percent with a lower bound of the 95 percent confidence interval that is greater than or equal to 80 percent. The sensitivity estimate for the device when testing for influenza B must be at the point estimate of at least 80 percent with a lower bound of the 95 percent confidence interval that is greater than or equal to 70 percent.
(B) The specificity estimate for the device when testing for influenza A and influenza B must be at the point estimate of at least 95 percent with a lower bound of the 95 percent confidence interval that is greater than or equal to 90 percent.
(2) When performing testing to demonstrate the device meets the requirements in paragraph (b)(1) of this section, a currently appropriate and FDA accepted comparator method must be used to establish assay performance in clinical studies.
(3) Annual analytical reactivity testing of the device must be performed with contemporary influenza strains. This annual analytical reactivity testing must meet the following criteria:
(i) The appropriate strains to be tested will be identified by FDA in consultation with the Centers for Disease Control and Prevention (CDC) and sourced from CDC or an FDA-designated source. If the annual strains are not available from CDC, FDA will identify an alternative source for obtaining the requisite strains.
(ii) The testing must be conducted according to a standardized protocol considered and determined by FDA to be acceptable and appropriate.
(iii) By July 31 of each calendar year, the results of the last 3 years of annual analytical reactivity testing must be included as part of the device's labeling. If a device has not been on the market long enough for 3 years of annual analytical reactivity testing to have been conducted since the device received marketing authorization from FDA, then the results of every annual analytical reactivity testing since the device received marketing authorization from FDA must be included. The results must be presented as part of the device's labeling in a tabular format, which includes the detailed information for each virus tested as described in the certificate of authentication, either by:
(A) Placing the results directly in the device's § 809.10(b) of this chapter compliant labeling that physically accompanies the device in a separate section of the labeling where the analytical reactivity testing data can be found; or
(B) In the device's label or in other labeling that physically accompanies the device, prominently providing a hyperlink to the manufacturer's public Web site where the analytical reactivity testing data can be found. The manufacturer's home page, as well as the primary part of the manufacturer's Web site that discusses the device, must provide a prominently placed hyperlink to the Web page containing this information and must allow unrestricted viewing access.
(4) If one of the actions listed at section 564(b)(1)(A)-(D) of the Federal Food, Drug, and Cosmetic Act occurs with respect to an influenza viral strain, or if the Secretary of Health and Human Services (HHS) determines, under section 319(a) of the Public Health Service Act, that a disease or disorder presents a public health emergency, or that a public health emergency otherwise exists, with respect to an influenza viral strain:
(i) Within 30 days from the date that FDA notifies manufacturers that characterized viral samples are available for test evaluation, the manufacturer must have testing performed on the device with those viral samples in accordance with a standardized protocol considered and determined by FDA to be acceptable and appropriate. The procedure and location of testing may depend on the nature of the emerging virus.
(ii) Within 60 days from the date that FDA notifies manufacturers that characterized viral samples are available for test evaluation and continuing until 3 years from that date, the results of the influenza emergency analytical reactivity testing, including the detailed information for the virus tested as described in the certificate of authentication, must be included as part of the device's labeling in a tabular format, either by:
(A) Placing the results directly in the device's § 809.10(b) of this chapter compliant labeling that physically accompanies the device in a separate section of the labeling where analytical reactivity testing data can be found, but separate from the annual analytical reactivity testing results; or
(B) In a section of the device's label or in other labeling that physically accompanies the device, prominently providing a hyperlink to the manufacturer's public Web site where the analytical reactivity testing data can be found. The manufacturer's home page, as well as the primary part of the manufacturer's Web site that discusses the device, must provide a prominently placed hyperlink to the Web page containing this information and must allow unrestricted viewing access.
Submission Summary (Full Text)
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Image /page/0/Picture/1 description: The image shows the logo for ZymeTx, Inc. The logo features a stylized graphic to the left of the company name. Below the company name is the address "800 Research Parkway, Suite 100, Oklahoma City, OK 73104".
K982429
Suite 100 • Oklahoma City, OK 73104-3600 • 405 / 271-1314 • Fax 405 / 271-1944 • www.zymetx.com
## Appendix C Safety and Effectiveness Summary for Improved ZstatFlu® Test for Influenza Types A and B Virus 510(k) Summary as Required by Section 807.92(c) (Prepared July 10, 1998)
| Submtter's Name: | Craig D. Shimasaki, Ph.D.<br>Vice President, Research<br>ZymeTx, Inc.<br>800 Research Parkway, Suite 100<br>Oklahoma City, OK 73104<br>Phone: 405/271-1314<br>Fax: 405/271-1944 | Trade Name: | ZstatFlu® Test for Influenza<br>Types A and B Virus |
|------------------|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|----------------------|-----------------------------------------------------------------------------|
| Contact Person: | Craig D. Shimasaki, Ph.D.<br>Vice President, Research | Common Name: | Diagnostic Test for Direct<br>Detection of Influenza Types<br>A and B Virus |
| | | Classificaiton Name: | Influenza virus serological<br>regents per 807.87(c) |
This information is provided as a summary of the safety and effectiveness of the ZymeTx, Improved ZstatFlu® Test for Influenza Types A and B Virus. For more detailed information please refer to the product package insert.
The Improved ZstatFlu® Test for Influenza Types A and B Virus is an endogenous viralencoded enzyme assay (EVEA) and is intended for use in the qualitative determination of influenza types A and B from throat swab specimens. The Improved ZstatFlu® Test for Influenza Types A and B Virus is not intended for the detection of influenza C.
Influenza types A and B virus possess surface glycoproteins with neuraminidase activity, that hydrolyze substrates which contain alpha-ketosidically linked N-acetyIneuraminic acid (Neu5Ac). A modified Neu5Ac molecule has been synthesized and coupled to a chromogen to produce the neuraminidase substrate. In the presence of influenza types A and B virus the chromogenic substrate is then cleaved by the action of viral neuraminidase, releasing a free chromogen. This free chromogen precipitates to produce a blue color. The blue precipitate is then concentrated and collected from the reaction mixture onto a filter device.
## PERFORMANCE CHARACTERISTICS
Clinical studies were performed using the Improved ZstatFlu® Test for Influenza Types A and B Virus at seven separate locations throughout the United States. A portion of these sites conducted studies comparing the Improved ZstatFlu® Test for Influenza Types and A and B Virus results to results obtained from standard culture confirmation with monoclonal antibodies. All seven of the sites conducted reproducibility studies to determine that the
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Improved ZstatFlu® Test for Influenza Types A and B Virus would perform similarly in various physician offices, laboratories, clinics and hospital settings.
A total of 157 throat swab specimens were collected from field sites during the 1995-96 influenza season between November 11, 1995 to March 29, 1996. Each of these specimens were tested by the Improved ZstatFlu® Test for Influenza Types A and B Virus and tested by the reference method of viral isolation and culture confirmation with monoclonal antibodies. Six physicians and their nurses and technicians, from two separate physician offices in a Southwest region participated in the collection and testing of Improved ZstatFlu® Test for Influenza Types A and B Virus. Duplicate throat swab specimens were collected and transported by courier to a Southwestern viral testing laboratory for the culture portion of this testing.
Of the 157 specimens collected and tested, a total of 49/157 were positive by the viral isolation and culture confirmation method for influenza A (31%); 33/157 were positive by the viral isolation and culture confirmation method for influenza B (21%); 1/157 were positive by the viral isolation and culture confirmation method for parainfluenza type 1 (1%); 1/157 were positive by the viral isolation and culture confirmation method for adenovirus (1%); and 73/157 were negative by the viral isolation and culture confirmation method for the respiratory viruses (46%). No parainfluenza type 2 or 3, or respiratory syncytial virus were detected by the viral isolation and culture confirmation method during this study.
# SENSITIVITY AND SPECIFICITY RESULTS
## Detection of Influenza Types A and B
The Improved ZstatFlu® Test for Influenza Types A and B Virus detected 51/82 (62.2%) of culture confirmed positives for influenza type A and type B from throat swab specimens. The Improved ZstatFlu® Test for Influenza Types A and B Virus properly identified 74/75 (98.7%) of culture confirmed negatives for influenza types A and B virus from throat swab specimens.
## Detection of Influenza Types A
The Improved ZstatFlu® Test for Influenza Types A and B Virus detected 32/49 (65.3%) of culture confirmed positives for influenza type A and type B from throat swab specimens. The Improved ZstatFlu® Test for Influenza Types A and B Virus properly identified 107/108 (99.1%) of culture confirmed negatives for influenza type A virus from throat swab specimens.
### Detection of Influenza Types B
The Improved ZstatFlu® Test for Influenza Types A and B Virus detected 19/33 (57.6%) of culture confirmed positives for influenza type B from throat swab specimens. The Improved
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ZstatFlu® Test for Influenza Types A and B Virus properly identified 123/124 (99.2%) of culture confirmed negatives for influenza type B virus from throat swab specimens.
### IMPROVED ZSTATFLU® TEST FOR INFLUENZA TYPES A AND B VIRUS REPRODUCIBILITY
There was 100% correlation of results during the reproducibility testing of the Improved ZstatFlu® Test for Influenza Types A and B at seven physician offices, clinics, research laboratories and hospital settings conducted during the 1996-97 influenza season. We believe that this adequately demonstrates that the Improved ZstatFlu® Test for Influenza Types A and B will perform similarly in various test environment settings in the hands of various personnel.
#### TECHNICAL INFORMATION
For technical information and comments regarding this product, you may contact the Improved ZstatFlu® Test for Influenza Types A and B Virus Product Manager at (405) 271-1314.
This Safety and Effectiveness Summary has been provided as a part of the 510(k) notification for the Improved ZstatFlu® Test for Influenza Types A and B Virus
Craig D. Summoch Ph.D.
Shimasaki, Ph.D Vice President of Research
7/10/98
Date
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Image /page/3/Picture/2 description: The image shows the logo for the Department of Health & Human Services - USA. The logo is circular and contains the words "DEPARTMENT OF HEALTH & HUMAN SERVICES - USA" around the perimeter. In the center of the logo is a stylized image of an eagle.
Food and Drug Administration 2098 Gaither Road Rockville MD 20850
AUG 25 1998
Craig D. Shimasaki. Ph.D. Vice President of Research ZymeTx, Inc. 800 Research Parkway, Suite 100 Oklahoma City, OK 73104-3600
Re: K982429
Trade Name: (Improved) ZstatFlu® Test for Influenza Types A and B Virus Regulatory Class: I Product Code: GNX Dated: July 10, 1998 Received: July 13, 1998
Dear Dr. Shimasaki:
We have reviewed your Section 510(k) notification of intent to market the device referenced above and we 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). 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 either class II (Special Controls) or class III (Premarket Approval), it may be subject to such additional controls. Existing major regulations affecting your device can be found in the Code of Federal Regulations, Title 21, Parts 800 to 895. A substantially equivalent determination assumes compliance with the Current Good Manufacturing Practice requirements, as set forth in the Quality System Regulation (QS) for Medical Devices: General regulation (21 CFR Part 820) and that, through periodic QS inspections, the Food and Drug Administration (FDA) will verify such assumptions. Failure to comply with the GMP regulation may result in regulatory action. In addition, FDA may publish further announcements concerning your device in the Federal Register. Please note: this response to your premarket notification submission does not affect any obligation you might have under sections 531 through 542 of the Act for devices under the Electronic Product Radiation Control provisions, or other Federal laws or regulations.
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#### Page 2
Under the Clinical Laboratory Improvement Amendments of 1988 (CLIA-88), this device may require a CLIA complexity categorization. To determine if it does, you should contact the Centers for Disease Control and Prevention (CDC) at (770)488-7655.
This letter will allow you to begin marketing your device as described in your 510(k) premarket notification. The FDA finding of substantial equivalence of your device to a legally marketed 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 Part 801 and additionally 809.10 for in vitro diagnostic devices), please contact the Office of Compliance at (301) 594-4588. Additionally, for questions on the promotion and advertising of your device, please contact the Office of Compliance at (301) 594-4639. Also, please note the regulation entitled; "Misbranding by reference to premarket notification" (21 CFR 807.97). Other general information on your responsibilities under the Act may be obtained from the Division of Small Manufacturers Assistance at its toll free number (800) 638-2041 or at (301) 443-6597 or at its internet address "http://www.fda.gov/cdrh/dsmamain.html"
Sincerely yours,
Steven Gutman
Steven I. Gutman, M.D., M.B.A. Director Division of Clinical Laboratory Devices ... . . . Office of Device Evaluation Center for Devices and Radiological Health
Enclosure
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## INDICATIONS FOR USE STATEMENT
510(k) Number: `1098 2429`
Device Name: (Improved) ZstatFlu® Test for Influenza Types A and B Virus
Indications for Use:
The ZstatFlu® Test for Influenza Type A and B Viruses is an endogenous viral-encoded enzyme assay (EVEA) and is intended for use in the qualitative determination of influenza types A and B from throat swab specimens. The ZstatFlu® Test for Influenza Type A and B Viruses is not intended for the detection of influenza C. This test is indicated for the direct testing of patients presenting with influenza-like illnesses.
(Please do not write below this line - continue on another page if needed)
Concurrence of CDRH, Office of Device Valuation (ODE)
| Division Sign-Off | Woody Jufolo |
|-----------------------------------------|--------------|
| Division of Clinical Laboratory Devices | |
| 510(k) Number | K982429 |
| Prescription Use | <div style="text-align:center">X</div> | OR | Over-The-Counter Use |
|------------------|----------------------------------------|----|----------------------|
|------------------|----------------------------------------|----|----------------------|
(Per 21 CFR 801.109)
(Optional Format 1-2-96)
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1. Search: exact and fuzzy
Type a phrase like "coronary artery calcification" into the search box. You get two kinds of results. Exact results match the literal phrase — prefix searches work ("coronary artery calcificati") but suffix searches do not. Fuzzy results match on the meaning and intent of your phrase rather than the exact words, and are sorted by relevance score. Hover over the Exact or Fuzzy badge on any row to see exactly why it matched.
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Output name, acceptance criteria, observed values, development dataset description, and test dataset description. It's the same format we use for regulatory strategy output and Fast 510(k) input, and the fastest high-level fingerprint of an AI device. AI-generated but reliable in practice.
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Fuzzy results trail off in relevance as you scroll. Use three signals to decide how far down to go: the fuzzy badge explanations, the intended use column, and whether your target output (e.g., Cobb angle) still appears in the AI Performance sub-table. Once it stops appearing, you're past the relevant zone. A top hit with a low score (~0.4) and a stretched explanation is a hint the closest predicates are far away — the project may be headed for De Novo. Note the fuzzy search is a pattern match: it doesn't handle negation ("not") well, and hardware devices can appear — filter by SaMD/AI ML to cut them.
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Click "Show Chart" and segment by Regulation Number. Clicking a regulation takes you to the regulations tree.
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Open the Predicates tab for a family-tree view of predicate relationships. Click a node to trace its parents and children; selections from search carry over pre-selected. Commonly predicated devices are worth reading — a lot of people predicated them for a reason. The visual lineage is also handy on client calls, e.g. to show how a predicate family evolved and justify why your predicate still holds.
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A lot of people predicated them for a reason. Clicking a node traces parents and children, and selections from search carry over pre-selected.
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The Embeddings tab plots every matching document in a 2-D "galaxy map" where semantically similar devices cluster together. Hover or click clusters to explore, and let AI label the clusters for you. Embeddings beat product codes for grouping: two devices can carry different product codes (LLZ vs. QIH) yet do the same thing — the embedding captures the meaning of the intended use and device story. This is also exactly how retrieval-augmented generation (RAG) works under the hood, and it makes a great visual on client calls.
Try it yourself
Head to the search page and work through a few of these AI/ML fuzzy searches to build intuition: perivascular fat on CT · aortic valve calcification opportunistic screening on noncontrast CT · breast cancer prediction on digital pathology slides · autism detection · gestational age prediction · a hearing aid that can also detect a pulse · foundation model based analysis of ECG · large language models · penetration test. Watch how the relevance scores, intended use, and AI Performance tables tell you when results stop being meaningful.
