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Laboratory Influenza Page

2025-2026 Influenza Season Report  
MDHHS Laboratory Data  

The data shown here are the results obtained by the MDHHS Virology Laboratory from specimens for targeted public health testing plus surveillance testing through the Michigan Sentinel Physician and Sentinel Laboratory Programs.  The Sentinel Physician Program consists of medical provider sites from a variety of geographic locations throughout Michigan enrolled in the sentinel surveillance program. These providers represent private practice for adult and pediatric patients, as well as urgent and emergency care facilities, nursing homes and university health services. Michigan is now conducting routine influenza surveillance year-round.  Thus, MDHHS requests submission of two to three specimens for influenza A and B viral culture four times during the year: early influenza season, when influenza virus is beginning to circulate; middle season, during the peak of influenza activity; late season, as influenza activity diminishes; and in the summer months. Participation in this program is voluntary.  

The complete influenza season runs from October through April. The early/middle/late season definitions vary from year-to-year and are determined on a case-by-case basis.

Inf B 2009 A, H1 Seasonal A, H3 A, Unsubtypable LAIV
Time C N SE SW Tot C N SE SW Tot C N SE SW Tot Tot Tot
Oct 5 - 11 0 0 0 0 0 0 0 1 0 1 2 0 2 0 4 0 0
Sept 28 - Oct 4 0 0 0 0 0 0 0 1 0 1 1 0 0 0 1 0 0
 

   2025-2026 Guidance Documents

Influenza Test Algorithm - updated 10/2025
Influenza Guidance for Laboratories - updated 10/2025
Influenza Guidance for Healthcare Providers - updated 10/2025
Influenza Guidance for Local Health Departments - updated 10/2025
Antiviral Resistance Information - updated 10/2025


   2025-2026 Northern Hemisphere Seasonal Influenza Vaccine Components

     The egg-based vaccines contain the following components:    

          A/Victoria/4897/2022 (H1N1) pdm09-like virus
          A/Croatia/10136RV/2023 (H3N2)-like virus
          B/Austria/1359417/2021 (B/Victoria lineage)-like virus           

     The recombinant or cell-culture quadrivalent vaccines contain the following components:    

          A/Wisconsin/67/2022 (H1N1) pdm09-like virus
          A/District of Columbia/27/2023 (H3N2)-like virus
          B/Austria/1359417/2021 (B/Victoria lineage)-like virus           


    Antiviral Resistance Testing

Antiviral Resistance Information - updated 10/2025


   Test Request Form

MDHHS Viral Respiratory Test Request Form - MDHHS-6097 (New 2-24)


   Specimen Collection and Shipping

Approved specimen types for influenza testing at the MDHHS BOL: 

  • Upper respiratory tract specimens such as nasopharyngeal swabs (NP), nasal swabs (NS), throat swabs (TS), dual NP/TS swabs, nasal washes (NW), and nasal aspirates (NA)
  • Lower respiratory tract specimens such as bronchoalveolar lavage (BAL), bronchial washes (BW), tracheal aspirates (TA), sputum (PCR only), lung tissue, and viral culture 

Quick Guide for Packaging and Shipping Influenza Specimens to BOL - updated 11/15/2010 
MDHHS BOL Flu Collection and Submission Guide - DCH-0772 (Rev. 2-24)
Biological Substance, Category B Shipping Label - DCH-0800 (Rev. 1-16) 


  CDC Influenza Advisories

 


 Influenza Resources    

National influenza surveillance summary information: 

CDC Weekly Influenza Surveillance page 
The CDC Influenza page
The World Health Organization


 Past Influenza Season Data  

Influenza season report for the 2015-2016 season
Influenza season report for the 2014-2015 season
Influenza season report for the 2013-2014 season
Influenza season report for the 2012-2013 season
Influenza season report for the 2011-2012 season
Influenza season report for the 2010-2011 season 
Influenza season report for the 2009-2010 season 
Influenza season report for the 2008-2009 season 
Summary of 2007/2008 Influenza Season report 
Summary of 2006/2007 Influenza Season report 
Summary of 2005/2006 Influenza Season report 
Influenza season report for the 2007-2008 season 
Influenza season report for the 2006-2007 season 
Influenza season report for the 2005-2006 season 
Influenza season report for the 2004-2005 season 
Influenza season report for the 2003-2004 season 
Influenza season report for the 2002-2003 season 

 

Rev. 10/20/2025