FluWatch

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Welcome to the influenza surveillance reporting website, brought to you by the Division of Communicable Disease Surveillance in the Center for Surveillance, Infection Prevention, and Outbreak Response at the Maryland Department of Health and Mental Hygiene (DHMH).

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CURRENT WEEK INFLUENZA ACTIVITY SUMMARY

During the week ending May 21, 2016, influenza-like illness (ILI) intensity was MINIMAL and the geographic spread was SPORADIC.

 

Click Here to View the Weekly Influenza Report
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
May 21, 2016​ ​Minimal
​May 14, 2016 ​Minimal
​May 7, 2016 ​Minimal
​April 30, 2016 Minimal​​
April 23, 2016​ Minimal​
​April 16, 2016 ​Minimal
​April 9, 2016 Minimal​
​April 2, 2016 ​Minimal
​March 26, 2016 Minimal​
​March 19, 2016 ​Minimal
​March 12, 2016 ​Moderate
​March 5, 2016 ​Low
​February 27, 2016​ High​
February 20, 2016​ ​Minimal
​February 13, 2016 ​Moderate
February 6, 2016​ ​Minimal
​January 30, 2016​ ​Low​
January 23, 2016​ ​Moderate
​January 16, 2016 Moderate​
​January 9, 2016 ​Low
​January 2, 2016 Moderate​
​December 26, 2015 Low​
​December 19, 2015 Minimal​
​December 12, 2015 Minimal​
​December 5, 2015 ​Minimal
​November 28, 2015 ​Minimal
​November 21, 2015 ​Minimal
November 14, 2015​ ​​Minimal
​November 7, 2015 ​Minimal
​​October 31, 2015 ​Minimal​
​October 24, 2015 ​Minimal
​October 17, 2015
​Minimal
​October 10, 2015 ​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 wheter 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
​May 21, 2016 Sporadic​
May 14, 2016​ ​Sporadic
​May 7, 2016 ​Local
​April 30, 2016 Local​​
​April 23, 2016 ​Local
​April 16, 2016 ​Local
​April 9, 2016 Regional​
April 2, 2016​ ​Widespread
​March 26, 2016 ​Widespread
​March 19, 2016 Widespread​
March 12, 2016​ ​Widespread
March 5, 2016​ ​Widespread
​February 27, 2016​ ​Widespread
February 20, 2016​ ​Widespread
​February 13, 2016 ​Widespread
February 6, 2016​ ​Regional
​January 30, 2016​ ​Regional​
January 23, 2016​ Widespread​
January 16, 2016​ ​Widespread
January 9, 2016​ ​Local
​January 2, 2016 Widespread​
​December 26, 2015 ​Regional
​December 19, 2016 ​Regional
​December 12, 2015 ​Regional
​December 5, 2015 ​Local
​November 28, 2015 ​Local
​November 21, 2015 ​No Activity
November 14, 2015​ ​Sporadic​
​November 7, 2015 ​Sporadic
​​October 31, 2015 ​No Activity​
​October 24, 2015 ​No Activity
​October 17, 2015 ​No Activity
​October 10, 2015 ​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 co munity.  For example, a "novel" or "variant" strain will not have a vaccine available.  There are also some strains of influenza that have developoed resistance against antiviral medication.  And there are some strains that will not match the strains in the seasonal flu vaccine.  Knowing what is circultraing 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
​May 21, 2016 ​Type B
​May 14, 2016 ​Type B
​May 7, 2016 ​Type B
​April 30, 2016 T​ype B​​​
​April 23, 2016 Type A (H1)​
​April 16, 2016 ​Type A (H1)
​April 9, 2016 ​Type A (H1)
​April 2, 2016 Type A (H1)​
​March 26, 2016 Type A (H1)​​
​March 19, 2016 Type A (H1)​
March 12, 2016​ ​Type A (H1)
March 5, 2016​ ​Type A (H1)
​February 27, 2016​ Type A (H1)​
February 20, 2016​ ​Type A (H1)
February 13, 2016​ ​Type A (H1)
​February 6, 2016 ​Type A (H1)
​January 30, 2016 ​Type A (H1)
​January 23, 2016 ​​Type A (H1)
​January 16, 2016 ​Type A (H1)
​January 9, 2016 T​ype B​​
​January 2, 2016 ​Type A (H1)
​December 26, 2015 ​Type A (H1)
​December 19, 2015 Type A (H1)​
​December 12, 2015 ​N/A
​December 5, 2015 ​Type A (H1)
​November 28, 2015 ​N/A
​November 21, 2015 ​N/A
November 14, 2015​ Type A (H3)​
​November 7, 2015 ​Type A (H3)
October 31, 2015​ N/A​
​October 24, 2015 ​N/A
​October 17, 2015 ​Type A (H3)
​October 10, 2015 ​N/A




 





PREVIOUS WEEKLY REPORTS FOR 2015-2016

 

​Week Ending ​File
​May 14, 2016 PDF
​May 7, 2016 PDF
​April 30, 2016 PDF
​April 23, 2016 PDF
​April 16, 2016 PDF
​April 9, 2016 PDF
​April 2, 2016 PDF
​March 26, 2016 PDF
​March 19, 2016 PDF
​March 12, 2016 PDF
​March 5, 2016 PDF
​February 27, 2016 PDF
​February 20, 2016 PDF
​February 13, 2016  PDF 
​February 6, 2016 PDF
​January 30, 2016 PDF
​January 23, 2016 PDF
​January 16, 2016 PDF
​January 9, 2016 PDF
​January 2, 2016 PDF
​December 26, 2015 PDF
​December 19, 2015 No Report​
​December 12, 2015 PDF
​December 5, 2015 PDF
​November 28, 2015 PDF
​November 21, 2015 No Report​
​November 14, 2015 PDF
November 7, 2015​ PDF
​October 31, 2015
PDF
​​October 24, 2015 PDF
​October 17, 2015
PDF
​October 10, 2015 PDF
 

 

PREVIOUS SEASON SUMMARIES
 

​Season ​File
​2014-2015 PDF
​2013-2014 PDF
​2012-2013 PDF
​2011-2012 PDF
​2010-2011 PDF
​2009-2010 PDF
​2008-2009 PDF
​2007-2008 PDF