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Laboratory Influenza Page
For this Influenza Season, the Michigan Department of Health and Human Services (MDHHS) Bureau of Laboratories will be performing testing for all flu strains which include 2009 A H1, seasonal flu A types and Flu B. In addition, MDHHS continues to highly encourage confirmatory influenza testing for cases of public health interest (ICU hospitalizations, severely ill pregnant women, patients with unusual and severe presentations, deaths) and for congregate setting outbreak/cluster investigations. MDHHS is reminding laboratories to please submit all rapid positive flu for confirmation.
Please note the approved specimen types for Flu PCR analysis have been expanded to include all of the following:
- 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, lung tissue, and viral culture
- Lower respiratory tract specimens such as bronchoalveolar lavage (BAL), bronchial washes (BW), tracheal aspirates (TA), sputum, lung tissue, and viral culture
For the most current updates, see the latest MIFluFocus report . For the latest information on the current influenza season, see the MDHHS Influenza Page.
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 influenza season runs from October through the end of September each year.
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 | |||||||||
Sep 22 - 28 | 0 | 0 | 0 | 1 | 1 | 0 | 0 | 0 | 1 | 1 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
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Sep 15 - 21 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
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Sep 8 - 14 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
|||||||||
Sep 1 - 7 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 1 | 0 | 0 | 2 | 3 | 0 | 0 |
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Aug 25 - 31 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 1 | 1 | 0 | 0 |
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Aug 18 - 24 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 1 | 1 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
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Aug 11 - 17 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
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Aug 4 - 10 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 1 | 0 | 0 | 0 | 1 | 0 | 0 |
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July 2024 | 0 | 0 | 0 | 1 | 1 | 1 | 0 | 0 | 1 | 2 | 1 | 0 | 0 | 5 | 6 | 1 | 0 | |||||||||
June 2024 | 1 | 0 | 1 | 1 | 3 | 1 | 0 | 1 | 2 | 4 | 0 | 0 | 1 | 0 | 1 | 1 | 0 | |||||||||
May 2024 | 5 | 0 | 9 | 4 | 18 | 2 | 0 | 6 | 5 | 13 | 4 | 0 | 4 | 3 | 11 | 0 | 0 | |||||||||
April 2024 | 7 | 0 | 16 | 14 | 37 | 11 | 0 | 6 | 6 | 23 | 8 | 0 | 11 | 7 | 26 | 2 | 0 | |||||||||
March 2024 | 29 | 0 | 16 | 3 | 48 | 17 | 1 | 9 | 26 | 53 | 23 | 0 | 13 | 28 | 64 | 2 | 0 | |||||||||
February 2024 | 16 | 0 | 12 | 7 | 35 | 23 | 0 | 20 | 56 | 99 | 17 | 0 | 17 | 30 | 64 | 0 | 0 | |||||||||
January 2024 | 6 | 2 | 11 | 7 | 26 | 47 | 2 | 20 | 33 | 102 | 11 | 4 | 4 | 13 | 32 | 3 | 0 | |||||||||
December 2023 | 1 | 1 | 16 | 0 | 18 | 18 | 4 | 41 | 20 | 83 | 6 | 3 | 14 | 9 | 32 | 4 | 0 |
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November 2023 | 9 | 0 | 7 | 1 | 17 | 15 | 2 | 42 | 10 | 69 | 1 | 0 | 4 | 0 | 5 | 0 | 0 |
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October 2023 | 1 | 0 | 4 | 0 | 5 | 15 | 0 | 18 | 7 | 40 | 1 | 0 | 3 | 0 | 4 | 2 | 0 |
2023-2024 Guidance Documents
Influenza Test Algorithm - updated 10/2023
Influenza Guidance for Laboratories - updated 10/2023
Influenza Guidance for Healthcare Providers - updated 10/2023
Influenza Guidance for Local Health Departments - updated 10/2023
Antiviral Resistance Information - updated10/2023
2023-2024 Northern Hemisphere Seasonal Influenza Vaccine Components
The egg-based vaccines contain the following components:
A/Victoria/4897/2022 (H1N1) pdm09-like virus
A/Darwin/9/2021 (H3N2)-like virus
B/Austria/1359417/2021 (B/Victoria lineage)-like virus
B/Phuket/3073/2013 (Yamagata lineage)-like virus
The recombinant or cell-culture quadrivalent vaccines contain the following components:
A/Wisconsin/67/2022 (H1N1) pdm09-like virus
A/Darwin/6/2021 (H3N2)-like virus
B/Austria/1359417/2021 (B/Victoria lineage)-like virus
B/Phuket/3073/2013 (Yamagata lineage)-like virus
Antiviral Resistance Testing
Antiviral Resistance Information - updated 10/2023
Test Request Form
MDHHS Test Request Form
Quick Guide for Filling Out the MDHHS Test Request Form
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 9/15/2009
Quick Guide for Making Influenza Specimen Collection Kits - updated 8/26/2009
MDHHS BOL Flu Collection Guide - updated 10/17/2013
Biological Substance, Category B Shipping Label - DCH-0800 - updated 12/21/2009
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 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. 10/08/2024