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​​​​​​Office of Governor 

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 April 12, 2014, influenza-like illness (ILI) intensity was MINIMAL and there was LOCAL geographic spread of influenza.

This means that ILI visits reported by sentinel providers were below baseline in the state overall; there was one outbreak of influenza, and 34 PCR-positive specimens tested at the DHMH lab.

Click here to view the Weekly Influenza Report

Reports are updated by close-of-business on Fridays unless otherwise noted.

PREVIOUS 2013-14 FLU REPORTS
Week Ending​ File​
​April 5, 2014 PDF
​March 29, 2014 PDF
March 22, 2014 PDF
​March 15, 2014 PDF
​March 8, 2014 PDF
​March 1, 2014 PDF
February 22, 2014​​ PDF
February 15, 2014​ PDF
​February 8, 2014 PDF
​February 1, 2014 PDF
January​ 25, 2014​​ PDF
January 18, 2014​ PDF ​
​January 11, 2014 PDF
​January 4, 2014 PDF
​December 28, 2013 PDF
​December 21, 2013 PDF
​December 14, 2013 PDF
December 7, 2013​ PDF
November 30, 2013​ PDF
​November 23, 2013 No Report (Holiday)​​
November 16, 2013​ PDF
November 9, 2013​ PDF
November 2, 2013​ PDF
​October 26, 2013 PDF
October 19, 2013​ PDF
October 12, 2013 PDF
​October 5, 2013 PDF

 

PREVIOUS SEASON SUMMARIES
Season File​
​2012 - 2013 PDF
​2011 - 2012 PDF
2010 - 2011 PDF
2009 - 2010 PDF
2008 - 2009 PDF
2007 - 2008 PDF
 
​​​​
 INFLUENZA SURVEILLANCE INDICATORS

Geographic Spread 
One of the indicators we look at is the geographic spread of influenza activity. By looking at where sentinel providers are reporting flu-like illnesses, where specimens are being submitted for testing, and where outbreaks are, 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​ ​Geographic Spread Interpretation​
​April 12, 2014 ​Local ​Thirty-four lab-confirmed cases, one influenza outbreak, and elevated ILI in one region.
​April 5, 2014
​Local ​Thirty-four lab-confirmed cases, one influenza outbreak, and elevated ILI in one region.
​March 29, 2014 Local​​ ​Fifty-three lab-confirmed cases, no respiratory outbreaks, and elevated ILI in one region.
​March 22, 2014 ​Local ​Twenty-six lab-confirmed cases, four respiratory outbreaks, and elevated ILI in one region.
​March 15, 2014 ​Local ​Sixty-three lab-confirmed cases, four respiratory outbreaks, and elevated ILI in one region.
​March 8, 2014 ​Local ​Fifty-five lab-confirmed cases, one influenza outbreak, and elevated ILI in one region in Maryland.
March 1, 2014 Widespread​​ ​One hundred eighteen lab-confirmed cases, one pneumonia and two influenza outbreaks, and elevated ILI in two Maryland regions.
February 22, 2014​ ​Widespread ​Seventy-seven lab-confirmed cases, one influenza outbreak, and elevated ILI in two Maryland regions.
​February 15, 2014 ​Widespread ​Eighty-seven lab-confirmed cases, one influenza outbreak, and elevated ILI in two Maryland regions.
​February 8, 2014
​Widespread ​One hundred thirty-two lab-confirmed cases, one influenza outbreak, and elevated ILI in two Maryland regions.
February 1, 2014 Widespread​​ One hundred sixty-three lab-confirmed cases, two influenza outbreaks, and elevated ILI in three Maryland regions.
January 25, 2014​ ​Widespread ​Fifty-nine lab-confirmed cases, two influenza outbreaks, and elevated ILI in two Maryland regions.
January 18, 2014​ ​Widespread ​One hundred twenty-nine lab-confirmed cases.  All five regions had either elevated ILI or an outbreak of respiratory disease.
​January 11, 2014 ​Widespread ​One hundred eighty-nine lab-confirmed cases, one pneumonia outbreak, and elevated ILI in three regions.
January 4, 2014​ ​Regional ​One hundred thirty-seven lab-confirmed cases, two influenza outbreaks, and elevated ILI visits in two Maryland regions.
December 28, 2013 Regional​ Seventy-seven lab-confirmed cases, one ILI outbreak, and elevated ILI visits in two regions in Maryland.
December 21, 2013​ ​Local ​Eighty-two lab-confirmed cases, one ILI outbreak, and elevated ILI visits in one region in Maryland.
December 14, 2013 Local​ ​Forty lab-confirmed cases, two respiratory outbreaks, and elevated ILI visits in one region in Maryland.
December 7, 2013​ ​Regional ​Twenty-five lab-confirmed cases, no outbreaks, and elevated ILI visits in two regions in Maryland.
November 30, 2013​ ​Local One lab-confirmed case, one ILI outbreak, and elevated ILI visits in one region in Maryland.
November 23, 2013​ Sporadic​ ​Low levels of influenza activity; isolated lab cases, no outbreaks, and visits for ILI below baseline.
November 16, 2013​ ​Local ​Three lab-confirmed cases, one ILI outbreak, and elevated ILI visits in one region in Maryland.
​November 9, 2013 ​No Activity ​​Low levels of influenza activity; no lab-confirmed cases, one ILI outbreak, and visits for ILI below baseline.
​November 2, 2013 ​Sporadic ​​Low levels of influenza activity; isolated lab cases, one ILI and one pneumonia outbreak, and visits for ILI below baseline.
​October 26, 2013​ No Activity​ ​Low levels of influenza activity; no lab confirmed cases, no outbreaks, and visits for ILI below baseline.
October 19, 2013​ No Activity​ ​Low levels of influenza activity; no lab confirmed cases, no outbreaks, and visits for ILI below baseline.
October 12, 2013​ Sporadic​ ​Low levels of influenza activity; isolated lab cases, no outbreaks, and visits for ILI  below baseline.
​October 5, 2013 ​Sporadic ​Low levels of influenza activity; isolated lab cases, one pneumonia outbreak, and visits for ILI well below baseline.
 
 
Influenza-like Illness Intensity
A second indicator we look at is the proportion of visits to sentinel providers for influenza-like illness (ILI). Intensity is measured against a baseline proportion of visits on a scale of minimal, low, moderate, and high.

​Week Ending ​ILI Intensity ​Interpretation
​April 12, 2014 ​Minimal ​The proportion of people visitng sentinel providers for ILI was below baseline.
​April 5, 2014 ​Minimal ​The proportion of people visiting sentinel providers for ILI was below baseline.
​March 29, 2014 Minimal​ ​The proportion of people visiting sentinel providers for ILI was below baseline.
​March 22, 2014 ​Minimal ​The proportion of people visiting sentinel providers for ILI was below baseline.
​March 15, 2014 ​Minimal ​The proportion of people visiting sentinel providers for ILI was below baseline.
​March 8, 2014 ​Minimal ​The proportion of people visiting sentinel providers for ILI was below baseline.
​March 1, 2014 ​Minimal ​The proportion of people visitng sentinel providers for ILI was slightly below baseline.
​February 22, 2014​ ​Minimal ​The proportion of people visitng sentinel providers for ILI was slightly below baseline.
​February 15, 2014
​Moderate ​The proportion of people visiting sentinel providers for ILI was above baseline.
​February 8, 2014 ​Moderate ​The proportion of people visiting sentinel providers for ILI was high, compared to baseline.
February 1, 2014​ ​Minimal ​The proportion of people visiting sentinel providers for ILI was slightly above baseline.
​January 25, 2014 ​Minimal ​The proportion of people visiting sentinel providers for ILI was slightly above baseline.
January 18, 2014​ ​Low ​The proportion of people visiting sentinel providers for ILI was above baseline.
​January 11, 2014 ​Minimal ​The proportion of people visiting sentinel providers for ILI was slightly above baseline.
​January 4, 2014 ​Minimal ​The proportion of people visiting sentinel providers for ILI was slightly above baseline.
December 28, 2013​ Minimal​ ​The proportion of people visitng sentinel providers for ILI was slightly above baseline.
​December 21, 2013 ​Minimal ​The proportion of people visitng sentinel providers for ILI was low, compared to baseline.
December 14, 2013​​ Minimal​​ ​​The proportion of people visitng sentinel providers for ILI was low, compared to baseline.
December 7, 2013​ ​Minimal ​The proportion of people visitng sentinel providers for ILI was low, compared to baseline.
​November 30, 2013 Minimal​ ​​​The proportion of people visiting sentinel providers for ILI was low, compared to baseline.​
November 23, 2013​ ​Minimal ​​​The proportion of people visiting sentinel providers for ILI was low, compared to baseline.​
November 16, 2013​ ​Minimal ​​The proportion of people visiting sentinel providers for ILI was low, compared to baseline.​
​November 9, 2013 ​Minimal ​The proportion of people visiting sentinel providers for ILI was low, compared to baseline.​
November 2, 2013​ ​Minimal ​​The proportion of people visiting sentinel providers for ILI was low, compared to baseline.​
October 26, 2013​​ ​Minimal ​The proportion of people visiting sentinel providers for ILI was low, compared to baseline.​
October 19, 2013​ Minimal​ ​The proportion of people visiting sentinel providers for ILI was low, compared to baseline.​
October 12, 2013​ MInimal​ ​The proportion of people visiting sentinel providers for ILI was low, compared to baseline.​
​October 5, 2013 ​Minimal ​The proportion of people visiting sentinel providers for ILI was low, compared to baseline.​

 

 

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 against it for a while. There are also some strains of influenza that have developed resistance against 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 12, 2014
​Type B Influenza
​April 5, 2014 ​Type B Influenza
March 29, 2014​​ ​Type A Influenza (2009 H1N1)​
​March 22, 2014 ​Type A Influenza (2009 H1N1)
​March 15, 2014 ​Type A Influenza (2009 H1N1)
​March 8, 2014 ​Type A Influenza (2009 H1N1)
March 1, 2014​ ​Type A Influenza (2009 H1N1)​
February 22, 2014 ​Type A Influenza (2009 H1N1)
​February 15, 2014 ​Type A Influenza (2009 H1N1)
​February 8, 2014 ​Type A Influenza (2009 H1N1)
February 1, 2014​​ ​Type A Influenza (2009 H1N1)​​
​January 25, 2014 ​Type A Influenza (2009 H1N1)​
​January 18, 2014 ​Type A Influenza (2009 H1N1)
​January 11, 2014 ​Type A Influenza (2009 H1N1)
​January 4, 2014 ​Type A Influenza (2009 H1N1)
December 28, 2013​ Type A Influenza (2009 H1N1)​​​
December 21, 2013​​ Type A Influenza (2009 H1N1)​​
December 14, 2013​ ​Type A Influenza (2009 H1N1)​
December 7, 2013​ ​Type A Influenza (2009 H1N1)
​November 30, 2013 ​Type A Influenza (2009 H1N1)​
November 23, 2013​ ​Type A Influenza (2009 H1N1)​
November 16, 2013​ ​Type A Influenza (2009 H1N1)
​November 9, 2013 ​N/A (No positive results)
​November 2, 2013 ​Type A Influenza (H3N2)
October 26, 2013​ ​N/A (No positive results)
October 19, 2013 ​N/A (No positive results)
October 12, 2013​ ​Type A Influenza (2009 H1N1)
​October 5, 2013 ​Type A Influenza (2009 H1N1)