Fact Sheet for Healthcare Providers: Interpreting TessArray® Resequencing Influenza A Microarray Detection Panel (TessArray RM-Flu) Test Results
The information previously contained on these webpages were authorized under the 2009 H1N1 Influenza Emergency Use Authorizations (EUAs). As of June 23, 2010, the EUAs have been terminated and this information is no longer current.
December 16, 2009
A public health emergency has been declared by the Secretary of Health and Human Services because of the outbreak of the 2009 H1N1 influenza virus (previously referred to as swine influenza (H1N1) virus). This Fact Sheet will refer to the virus as 2009 H1N1 influenza virus. The Food and Drug Administration (FDA) has authorized the emergency use of the TessArae® Resequencing Influenza A Microarray Detection Panel (TessArray RM-Flu) to test for the presence of the 2009 H1N1 influenza virus in clinical respiratory specimens. These specimens should be collected via throat swabs from patients with signs and symptoms of respiratory infection. This authorization will terminate on April 26, 2010, when the emergency declaration is terminated (unless it is renewed), or when the authorization has been revoked, whichever is earlier. The information in this Fact Sheet is the minimum necessary to inform you of the significant known and potential risks and benefits of the emergency use of the TessArray RM-Flu test.
At this time, there are no FDA-approved or cleared tests that identify the existence of the 2009 H1N1 influenza virus in clinical specimens. Previously, the FDA granted Emergency Use Authorization for other tests intended to diagnose 2009 H1N1 influenza virus, see http://www.fda.gov/MedicalDevices/Safety/EmergencySituations/ucm161496.htm for more information. The FDA has authorized the emergency use of the TessArray RM-Flu on the Affymetrix GeneChip Microarray Instrumentation System, GCS 3000, by CLIA High Complexity Laboratories, to detect 2009 H1N1 influenza virus infection aided by an algorithm that relies on seasonal influenza A/H1 virus and seasonal influenza A/H3 virus results. This will augment existing testing capacity, and provide a test utilizing a different testing concept than the currently authorized PCR-based tests, thereby mitigating the risk of not detecting new variants of 2009 H1N1 influenza virus. Current information on 2009 H1N1 influenza virus, including case definitions and infection control guidelines, is available at http://www.cdc.gov/h1n1flu/. All information and guidelines, including those on testing for 2009 H1N1 influenza virus, may change as we continue to learn more about this virus. Please check CDC’s 2009 H1N1 influenza virus website regularly for the most current information.
The TessArray RM-Flu test should be ordered only to diagnose 2009 H1N1 influenza virus infection in patients with signs and symptoms of respiratory infection. This test is authorized for use with throat swabs. Specimen collection should be conducted according to the manufacturer’s instructions for the specimen collection device and sent to a qualified laboratory for analysis.
What does it mean if the specimen tests positive for the 2009 H1N1 influenza virus?
A positive test for 2009 H1N1 influenza virus using the TessArray RM-Flu indicates that the patient is infected with the 2009 H1N1 influenza virus. The test does not indicate the stage of infection. Laboratory test results should always be considered in the context of clinical observations and epidemiologic data in making a final diagnosis. For guidelines on managing patients please refer to “Interim Guidance on Infection Control Measures for 2009 H1N1 Influenza in Healthcare Settings, Including Protection of Healthcare Personnel” and “Updated Interim Recommendations for the Use of Antiviral Medications in the Treatment and Prevention of Influenza for the 2009-2010 Season” at http://www.cdc.gov/h1n1flu/guidance/.
The TessArray RM-Flu test for 2009 H1N1 influenza virus has been designed to minimize the likelihood of false positive test results. However, in the event of a false positive result, the risks to patients could include any or all of the following: recommendations to limit contact with uninfected persons (including at home or at the workplace), a prescription of antiviral medication or other therapy, the impaired ability to detect and receive appropriate medical care for the true infection causing the flu-like symptoms, or other unintended adverse effects.
What does it mean if the specimen tests negative for the 2009 H1N1 influenza virus?
Negative TessArray RM-Flu test results do not preclude influenza virus infection and should not be used as the sole basis for treatment or other patient management decisions. The clinical features of the illness and the type and risk of exposure are the keys to making patient management and isolation decisions. A negative result from the TessArray RM-Flu test should not be interpreted as demonstrating that the patient does not have 2009 H1N1 Influenza virus infection, if other aspects of the patient’s clinical presentation or recent epidemiologic exposures indicate that 2009 H1N1 Influenza virus infection is likely, and diagnostic tests for other causes of acute respiratory illness are negative.
TessArae, LLC 46090 Lake Center Plaza, Potomac Falls, VA 20165
Healthcare providers will be contacted by TessArae in the event of any significant new findings observed during the course of the emergency use of the TessArray RM-Flu test. Updated information on the TessArray RM-Flu test will be made available at http://www.tessarae.com/h1n1flu/.