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    We Need Your Help!

    Maryland residents can now help MDH track influenza activity in Maryland. Click here to read all about the program. ​


    MDH FluWatch​
    Welcome to the influenza surveillance reporting website, brought to you by the Division of Infectious Disease Surveillance in the Center for Surveillance, Infection Prevention, and Outbreak Response at the Maryland Department of Health (MDH).
    During the week ending November 10, 2018 (MMWR Week 45), influenza-like illness (ILI) intensity was MINIMAL and there was REGIONAL geographic activity of influenza.
    (Reports are updated by close-of-business on Fridays unless otherwise noted.)

    One indicator we look at is the proportion of visits to sentinel providers for ILI.  Intensity is measured against a baseline proportion of visits on a scale of minimal, low, moderate, and high. 
    ​Week Ending
    ​Intensity Level
    ​November 10, 2018 Minimal​
    ​November 3, 2018 ​Minimal​
    ​October 27, 2018 ​Minimal
    ​October 20, 2018 ​Minimal
    ​October 13, 2018 Minimal​​​
    ​October 06, 2018 Minimal​​
    A second indicator we look at is the geographic spread of influenza activity.  By looking at where sentinel providers are reporting ILI, where influenza and ILI outbreaks are occurring, and from where specimens are being submitted for testing, we can tell whether influenza is not active, sporadic, local, regional, or widespread.  This is not an indicator of disease severity, only of where the disease is located in Maryland.
    ​Week Ending
    ​Activity Level
    ​November 10, 2018 Regional​
    ​November 3, 2018 ​Regional​
    ​October 27, 2018 Sporadic​
    ​October 20, 2018 ​Sporadic
    ​October 13, 2018 Sporadic​
    ​October 6, 2018 Sporadic
    A third indicator we look at is the predominant strain of influenza circulating in Maryland.  This is important because different strains have different implications for the community.  For example, a 'novel' or 'variant' strain will not have a vaccine available.  There are also some strains of influenza that have developed resistance to antiviral medication.  And there are some strains that will not match the strains in the seasonal flu vaccine.  Knowing what is circulating​ is important in planning and responding to influenza outbreaks.  Refer to the weekly report for a full breakdown of the PCR test results reported.
    ​Week Ending
    Predominant Strain
    ​November 10, 2018 ​Type A (H1)
    ​November 3, 2018 Type A (H3)​​
    ​October 27, 2018 Type A (H1)​
    October 20, 2018 ​Type B (Victoria)
    ​October 13, 2018 Type B (Victoria)​​​
    ​October 6, 2018 Type A (H1)​​​​​​​​ / Type B (Victoria)​​
    Week Ending
    ​October 27, 2018 PDF
    ​October 20, 2018 PDF​
    ​October 13, 2018 PDF
    ​October 6, 2018 PDF
    ​May 19, 2018 PD​​F
    ​May 12, 2018 PDF
    ​May 5, 2018 PDF
    ​April 28, 2018 PDF
    ​April 21, 2018 PDF
    ​April 14, 2018 PDF
    ​April 7, 2018 PDF
    ​March 31, 2018 PDF
    ​March 24, 2018 PDF
    ​March 17, 2018 PDF
    ​March 10, 2018 PDF
    ​March 3, 2018 PDF
    ​February 24, 2018 PDF
    ​February 17, 2018 PDF
    ​February 10, 2018 PDF
    ​February 3, 2018 PDF
    ​January 27, 2018 PDF
    ​January 20, 2018 PDF
    ​January 13, 2018 PDF
    ​January 6, 2018 PDF
    ​December 30, 2017 PDF
    ​December 23, 2017 PDF
    ​December 16, 2017 PDF
    ​December 9, 2017 PDF
    ​December 2, 2017 PDF
    ​November 25, 2017 PDF
    ​November 18, 2017 ​No Report (Holiday)
    ​November 11, 2017 PDF
    ​November 4, 2017 PDF
    ​October 28, 2017 ​PDF
    ​October 21, 2017 ​PDF
    ​October 14, 2017 PDF
    ​October 7, 2017 PDF

    2017-2018 PDF
    2016-2017 PD​F​​