FluWatch

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MDH FluWatch​
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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).
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CURRENT WEEK INFLUENZA ACTIVITY SUMMARY
During the week ending April 7, 2018 (MMWR Week 14), influenza-like illness (ILI) intensity was MINIMAL and there was LOCAL geographic activity of influenza.
(Reports are updated by close-of-business on Fridays unless otherwise noted.)
 
​INFLUENZA SURVEILLANCE INDICATORS
ILI INTENSITY:

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
​April 7, 2017 Minimal​​​​
​March 31, 2017 Minimal​​​
​March 24, 2017 Minimal​​
​March 17, 2017 Minimal​
​March 10, 2018 Low​​
​March 3, 2018 Moderate​​
​February 24, 2018 ​High​​​​​
​February 17, 2018 High​​​​​
​February 10, 2018 High​​​​
​February 3, 2018 High​​​
​January 27, 2018 High​​
​January 20, 2018 High​​
​January 13, 2018 High​
​January 6, 2018 ​Low
​December 30, 2017 High
​December 23, 2017 Mini​mal​​​
​December 16, 2017 ​Mini​mal​​
​December 9, 2017 Mini​mal​​
​December 2, 2017 ​Mini​mal​
​November 25, 2017 Mini​mal​
​​​November 18, 2017 ​Mini​mal
​November 11, 2017 ​Minimal
​November 4, 2017 ​Minimal
​October 28, 2017 ​Minimal
October 21, 2017
​Minimal
​October 14, 2017 ​Minimal
​October 7, 2017 ​Minimal
 
 
GEOGRAPHIC ACTIVITY:
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
​April 7, 2017 Local​​
​March 31, 2017 Widespread​​​​​​​​​​​
​March 24, 2017 Widespread​​​​​​​​​​
​March 17, 2017 Widespread​​​​​​​​​
​March 10, 2018 ​​Widespread​​​​​​​​
​March 3, 2018 ​Widespread​​​​​​​​
​February 24, 2018 ​Widespread​​​​​​​​
​February 17, 2018 ​Widespread​​​​​​​​
​February 10, 2018 Widespread​​​​​​​​
​February 3, 2018 Widespread​​​​​​​
​January 27, 2018 Widespread​​​​​​
​January 20, 2018 ​Widespread​​​​​
​January 13, 2018 ​Widespread​​​​​
​January 6, 2018 Widespread​​​​​
​December 30, 2017 Widespread​​​​
​December 23, 2017 Widespread​​​
​December 16, 2017 Widespread​​
​December 9, 2017 Regional​​
​December 2, 2017 ​​Local
​November 25, 2017 ​Local
​November 18, 2017 ​Local
​November 11, 2017 Local​
​November 4, 2017 Sporadic​
​October 28, 2017 Sporadic​
October 21, 2017 ​Sporadic​
​October 14, 2017 Sporadic​
​October 7, 2017 ​No Activity
 
 
PREDOMINANT INFLUENZA STRAIN:
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
​April 7, 2017 Type A (H3)​​​​​​​​ / Type B (Yamagata)​​
​March 31, 2017 Type B (Yamagata)​​
​March 24, 2017 ​Type A (H3)​​​​​​​
​March 17, 2017 Type A (H3)​​​​​​​
​March 10, 2018 Type A (H3)​​​​​​
​March 3, 2018 Type A (H3)​​​​​
​February 24, 2018 Type B (Yamagata)​
​February 17, 2018 ​Type A (H3)​​​​
​February 10, 2018 ​Type A (H3)​​​​
​February 3, 2018 Type A (H3)​​​​
​January 27, 2018 Type A (H3)​​​
​January 20, 2018 Type A (H3)​​
​January 13, 2018 ​Type A (H3)​
​January 6, 2018 Type A (H3)​
​December 30, 2017 Type A (H3)​
​December 23, 2017 ​Type A (H3)​​
​December 16, 2017 Type A (H3)​​​
​December 9, 2017 Type A (H3)​​
​December 2, 2017 ​Type A (H3)​
​November 25, 2017 Type A (H3)​
​November 18, 2017 ​Type A (H3)
​November 11, 2017 None
​November 4, 2017 None
​October 28, 2017 ​Type A (H3)
​October 21, 2017 ​Type A (H3)
​October 14, 2017 ​Type A (H3)
​October 7, 2017 ​Type A (H3)
 
 
PREVIOUS WEEKLY REPORTS
Week Ending
​File
​March 31, 2017 PDF
​March 24, 2017 PDF
​March 17, 2017 PDF
​March 10, 2017 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
 
 
PREVIOUS SEASON SUMMARIES 
​Season
​File
2015-2016
PDF
​2014-2015
PDF
​2013-2014
PDF
​2012-2013
PDF
​2011-2012
PDF
​2010-2011
PDF