The OSOM Influenza A&B Test is an in vitro diagnostic immunochromatographic assay intended for the qualitative detection of influenza A and influenza B viral nucleoprotein antigens from nasal swab specimens in symptomatic patients. It is intended to aid in the rapid differential diagnosis of influenza A and/or B viral infections. This test is not intended for the detection of influenza C viruses. A negative test is presumptive and it is recommended these results be confirmed by cell culture. Negative results do not preclude influenza virus infection and should not be used as the sole basis for treatment or other management decisions.
Device Story
Lateral flow immunochromatographic assay for rapid differential diagnosis of influenza A and B. Input: nasal swab specimen. Process: specimen solubilized in extraction buffer; test stick inserted; viral antigens bind to colloidal gold-conjugated mouse monoclonal IgG antibodies; complex captured by membrane-bound antibodies. Output: visual pink/purple lines on test stick indicating presence of influenza A, B, or both; control line validates test. Used in clinical settings by healthcare professionals. Provides rapid results (10 minutes) to aid clinical decision-making; negative results require confirmatory cell culture.
Clinical Evidence
Bench testing only. Performance evaluated via cross-reactivity testing against various viral and bacterial entities, including Adenovirus, Coxsackievirus, Echovirus, Measles, Mumps, Parainfluenza, Rhinovirus, and RSV. No clinical trial data provided in the summary.
Technological Characteristics
Lateral flow immunochromatographic assay. Components: test stick, nitrocellulose membrane, mouse monoclonal IgG antibodies, colloidal gold conjugate. Specimen: nasal swab. Time to result: 10 minutes. Qualitative visual readout (pink/purple lines).
Indications for Use
Indicated for qualitative detection of influenza A and B viral nucleoprotein antigens in nasal swab specimens from symptomatic patients. Not for influenza C detection. Negative results are presumptive and require confirmation by cell culture.
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.
{0}------------------------------------------------
K061508
JUN 12 2 2066
OSOM® Influenza A&B Test 510(k)
#### 510(K) SUMMARY SECTION C.
Pursuant to Section 12, Part (a)(i)(3A) of the Safe Medical Devices Act of 1990, Genzyme Corporation is providing a summary of the safety and effectiveness information available for the OSOM® Influenza A&B Test.
- Sponsor/Applicant Name and Address: 1. Genzyme Corporation One Kendall Square Cambridge, MA 02139
- Sponsor Contact Information: 2. Fred D. Lasky, Ph.D. Director, Regulatory Affairs Phone: 617.591.5512 FAX: 617.768.9592 Email: fred.lasky@genzyme.com
- Date of Preparation of 510(k) Summary: 3. May 31, 2006
- 4. Device Trade or Proprietary Name: OSOM Influenza A&B Test
- Legally Marketed Devices to which Equivalence is Being Claimed: న. OSOM Influenza A&B Test (K 051244)
{1}------------------------------------------------
#### 6. Device Description:
## Intended Use
The OSOM Influenza A&B Test is an in vitro diagnostic immunochromatographic assay intended for the qualitative detection of influenza A and influenza B viral nucleoprotein antigens from nasal swab specimens in symptomatic patients. It is intended to aid in the rapid differential diagnosis of influenza A and/or B viral infections. This test is not intended for the detection of influenza C viruses. A negative test is presumptive and it is recommended these results be confirmed by cell culture. Negative results do not preclude influenza virus infection and should not be used as the sole basis for treatment or other management decisions.
## Principle of the Device
The OSOM Influenza A&B Test consists of a test stick that separately detects influenza A and B. The test procedure requires the solubilization of the nucleoproteins from a swab by mixing the swab in Extraction Buffer. The test stick is then placed in the sample mixture, which then migrates along the membrane surface. If influenza A and/or B viral antigens are present in the sample, it will form a complex with mouse monoclonal IgG antibodies to influenza A and/or B nucleoproteins conjugated to colloidal gold. The complex will then be bound by another mouse anti-influenza A and/or B antibody coated on the nitrocellulose membrane. A pink to purple control line must appear in the control region of the stick for results to be valid. The appearance of a second and possibly a third light pink to purple line will appear in the test line region indicating an A, B or A and B positive result.
### 7. Comparison of Technological Characteristics of Genzyme OSOM Influenza A&B Test with Legally Marketed Device:
The similarities with, and differences between, the OSOM Influenza A&B Test, with revised labeling, and the OSOM Influenza A&B Test (K 051244) device are described in the following table.
{2}------------------------------------------------
Image /page/2/Picture/0 description: The image shows the word "genzyme" in a simple, sans-serif font. The letters are black and the background is white. The word is written in all lowercase letters.
:
| | OSOM Influenza A&B Test | OSOM Influenza A&B Test<br>(K051244) |
|-------------------------------------|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| Intended use | The OSOM Influenza A&B Test<br>is an in vitro diagnostic<br>immunochromatographic assay<br>intended for the qualitative<br>detection of influenza A and<br>influenza B viral nucleoprotein<br>antigens from nasal swab<br>specimens in symptomatic<br>patients. It is intended to aid in<br>the rapid differential diagnosis of<br>influenza A and/or B viral<br>infections. This test is not<br>intended for the detection of<br>influenza C viruses. A negative<br>test is presumptive and it is<br>recommended these results be<br>confirmed by cell culture.<br>Negative results do not preclude<br>influenza virus infection and<br>should not be used as the sole<br>basis for treatment or other<br>management decisions. | Intended for the qualitative<br>detection of influenza A and<br>influenza B viral antigens from<br>nasal swab specimens. It is<br>intended to aid in the rapid<br>differential diagnosis of<br>influenza A and/or B viral<br>infections. The test is for use in<br>clinical laboratories, health<br>clinics, and physician office<br>laboratories. |
| Assay Format | Lateral flow immunoassay | Lateral flow immunoassay |
| Specimen | nasal swabs | nasal swabs |
| Antibodies (labeled<br>and capture) | Mouse monoclonals | Mouse monoclonals |
| Conjugate | Colloidal gold | Colloidal gold |
| Objective Test Line | Pink to purple line | Pink to purple line |
| Internal Control | Yes - Pink to purple line | Yes - Pink to purple line |
| Time To Result | 10 minutes | 10 minutes |
| Cross-reactivity data | Includes test listing of bacterial<br>and viral entities | Includes test listing of bacterial<br>entities |
Summary of Device Similarities and Differences
ﭘﺮ ﭘ
:
{3}------------------------------------------------
# genzyme
#### Potential Interfering Substances 8.
The following potential cross-reactant viruses were tested at levels greater than the limits of detection of the OSOM Influenza A&B Test for both influenza A and B (4.4 x 10*/test and 1.4 x 105/test, respectively), and were found to have no affect on the performance.
| Virus |
|-----------------------------|
| Adenovirus Type 1 |
| Adenovirus Type 2 |
| Adenovirus Type 3 |
| Adenovirus Type 6 |
| Coxsackievirus B2 |
| Coxsackievirus B3 |
| Coxsackievirus B4 |
| Coxsackievirus B5 |
| Echovirus Type 6 |
| Echovirus Type 11 (Gregory) |
| Echovirus 30 |
| Measles virus |
| Mumps virus (Enders strain) |
| Parainfluenza virus Type 1 |
| Parainfluenza virus Type 3 |
| Parainfluenza virus Type 4B |
| Rhinovirus 3 |
| Rhinovirus 7 |
| RSV (Long strain) |
{4}------------------------------------------------
Image /page/4/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 a stylized symbol resembling an abstract eagle or bird-like figure, composed of several curved lines.
#### Public Health Service
Food and Drug Administration 2098 Gaither Road Rockville MD 20850
JUN 12 2006
Fred D. Lasky, Ph.D. Director of Regulatory Affairs Genzyme Corporation 500 Kendall Street Cambridge, MA 02142
Re: k061508
> Trade/Device Name: OSOM® Influenza A&B Test Regulation Number: 21CFR 866.3330 Regulation Name: Influenza Virus Serological Reagents Regulatory Class: Class I Product Code: GNX Dated: May 31, 2006 Received: June 1. 2006
Dear Dr. Lasky:
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 either class II (Special Controls) or class III (PMA), 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); and good manufacturing practice requirements as set forth in the quality systems (QS) regulation (21 CFR Part 820).
{5}------------------------------------------------
## Page 2 -
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 predicate device results in a classification for your device and thus, permits your device to proceed to the market.
If you desire specific information about the application of labeling requirements to your device, or questions on the promotion and advertising of your device, please contact the Office of In Vitro Diagnostic Device Evaluation and Safety at (240)276-0484. Also, please note the regulation entitled, "Misbranding by reference to premarket notification" (21CFR Part 807.97), 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) 443-6597 or at its Internet address http://www.fda.gov/cdrh/industry/support/index.html
Sincerely yours,
Sally a Hom
Sally A. Hojvat, M.Sc., Ph.D. Director Division of Microbiology Devices Office of In Vitro Diagnostic Device Evaluation and Safety Center for Devices and Radiological Health
Enclosure
{6}------------------------------------------------
Indications for Use
6 1508 510(k) Number (if known):
Device Name: OSOM Influenza A&B Test
Indications for Use:
The OSOM Influenza A&B Test is an in vitro diagnostic immunochromatographic assay intended for the qualitative detection of influenza A and influenza B viral nucleoprotein antigens from nasal swab specimens in symptomatic patients. It is intended to aid in the rapid differential diagnosis of influenza A and/or B viral infections. This test is not intended for the detection of influenza C. viruses. A negative test is presumptive and it is recommended these results be confirmed by cell culture. Negative results do not preclude influenza virus infection and should not be used as the sole basis for treatment or other management decisions.
Prescription Use X
(Part 21 CFR 801 Subpart D)
Over-The-Counter Use
(21 CFR 801 Subpart C)
(PLEASE DO NOT WRITE BELOW THIS LINE-CONTINUE ON ANOTHER PAGE OF NEEDED)
AND/OR
Concurrence of CDRH, Office of Device Evaluation (ODE) Division Sign-Off
Page | of
Office of In Vitro Diagnostic Device Evaluation and Safety
510(k)_ KO 1504
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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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Scroll right in the search results table. The intended use column is extracted for you; no need to dig into the 510(k) summary PDF.
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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.
3. Judging fuzzy relevance
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.
How do you judge how far down fuzzy search results to go?
Use the relevancy signals: the fuzzy badge explanations, the intended use column, and whether the target output (e.g., Cobb angle) still appears in the AI Performance sub-table. Once it stops appearing, results are trailing off in relevancy.
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Select multiple rows in the results table (aim for under ~10), then open the PDF Viewer tab. Ask one question — it goes to all selected devices in parallel, each with citations. This is the fastest way to compare and contrast devices: training data, PCCP scope, how they handled adding new scanners, and so on.
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Browse product codes and regulation numbers, read the identification text and special controls, browse sibling product codes, open device PDFs on the right, and search by product code or regulation number at the top of the tree.
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Click Show Chart and segment by regulation number (or product code) to see which regulations dominate your result set. Clicking a regulation takes you into the regulations tree. Great for spotting that most matches are, say, hardware laparoscopic devices — a cue to go back and filter.
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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.
