​​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 13, 2019 (MMWR Week 15), influenza-like illness (ILI) intensity was MINIMAL and there was REGIONAL geographic activity. 
(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. 

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.

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
​Intensity Level
​Activity Level Predominant Strain
​April 13,2019 ​Minimal ​Regional ​Type A (H3)
​April 6, 2019 ​Minimal Widespread​ ​Type A (H3)
​March 30, 2019 Moderate​ Widespread​ Type A (H3)​
​March 23, 2019 ​Moderate ​Widespread ​Type A (H3)
​March 16, 2019 ​Moderate ​Widespread Type A (H1)​​
​March 9, 2019 ​Moderate ​Widespread ​​Type A (H1)
​March 2, 2019 ​Minimal ​Widespread ​Type A (H1)
​February 23, 2019 High​​ Widespread​​ Type A (H1)​​
​February 16, 2019 Moderate​ Widespread​ Type A (H1)​
​February 9, 2019 High​ ​Widespread ​Type A (H1)
​February 2, 2019 Low​ ​Widespread ​Type A (H1)
​January 26, 2019 High​ Widespread​ Type A (H1)​
​January 19, 2019 ​High ​Widespread ​​Type A (H1)
​January 12, 2019 ​Moderate ​Regional ​​Type A (H1)
​January 5, 2019 High​ ​Regional ​Type A (H1)
​December 29, 2018 ​Minimal ​Local ​Type A (H1)
​December 22, 2018 High​​ N/A ​Type A (H1)​
​December 15, 2018 ​Minimal ​Local ​Type A (H1)
​December 8, 2018 ​Minimal ​Local ​Type A (H1)
​December 1, 2018 ​Minimal​ ​​Sporadic​ Type A (H1)​​​
​November 24, 2018 Minimal​ ​​Sporadic Type A (H1)​​
​November 17, 2018 ​Minimal ​Sporadic Type A (H1)​
​November 10, 2018 Minimal​ Regional​ ​​Type A (H1)
​November 3, 2018 ​Minimal​ Regional​ Type A (H3)​​​
​October 27, 2018 ​Minimal Sporadic​ ​Type A (H1)​
​October 20, 2018 ​Minimal Sporadic​ ​​Type B (Victoria)
​October 13, 2018 Minimal​​​ ​Sporadic ​Type B (Victoria)​​​
​October 6, 2018 Minimal​​ Sporadic​​ ​Type A (H1)​​​​​​​​ / Type B (Victoria)​​​
 
 

 
 
 

 
 
 
PREVIOUS WEEKLY REPORTS
Week Ending
​File
​April 6, 2019 PDF
​March 30, 2019 PDF
​March 23, 2019 PDF
​March 16, 2019 PDF
​March 9, 2019 PD​F
​March 2, 2019 P​DF
​February 23, 2019 PDF
​February 16, 2019 PDF
​February 9, 2019 P​DF
​February 2, 2019 PDF
​January 26, 2019 PDF 
​January 12, 2019 PDF 
​January 5, 2019 PDF
December 29, 2018 PDF
​December 22,2018 PDF
​December 15, 2018 PDF
​December 8, 2018 PDF
​December 1, 2018 PDF
​November 24, 2018 PDF
​November 17, 2018 PDF
​November 10, 2018 PDF
​​November 3, 2018​ PDF
​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
 
 
PREVIOUS SEASON SUMMARIES 

​Season
​File
2017-2018 PDF
2016-2017 PD​F​​
2015-2016
PDF
​2014-2015
PDF
​2013-2014
PDF
​2012-2013
PDF
​2011-2012
PDF
​2010-2011
PDF
 ​
 
 

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