Flu Activity and Surveillance

Influenza surveillance is a collaborative effort among the Centers for Disease Control & Prevention, state health departments, health care providers, laboratories, clinics and emergency departments. More about influenza surveillance methods

The Vermont Department of Health monitors flu activity in the state throughout the year using different surveillance methods. Flu activity is summarized weekly and put into a report that is available to both providers and the public. This report gives a weekly snapshot of syndromic surveillance and sentinel influenza-like illness (ILI) data, as well as weekly and cumulative laboratory tests and results.

2017 Weekly Surveillance Reports
Title Date Type
Flu Report Week 1
Geographic Spread Level is Local
01/11/2017 PDF Download
Flu Report Week 2
Geographic Spread Level is Local
01/19/2017 PDF Download
Flu Report Week 3
Geographic Spread Level is Regional
01/25/2017 PDF Download
Flu Report Week 4
Geographic Spread Level is Regional
02/01/2017 PDF Download
Flu Report Week 5
Geographic Spread Level is Widespread
02/09/2017 PDF Download
Flu Report Week 6
Geographic Spread Level is Widespread
02/16/2017 PDF Download
Flu Report Week 7
Geographic Spread Level is Widespread
02/23/2017 PDF Download
Flu Report Week 8
Geographic Spread Level is Widespread
03/02/2017 PDF Download
Flu Report Week 9
Geographic Spread Level is Widespread
03/09/2017 PDF Download
Flu Report Week 10
Geographic Spread Level is Widespread
03/16/2017 PDF Download
Flu Report Week 11
Geographic Spread Level is Widespread
03/23/2017 PDF Download
Flu Report Week 12
Geographic Spread Level is Widespread
03/30/2017 PDF Download
Flu Report Week 13
Geographic Spread Level is Widespread
04/06/2017 PDF Download
Flu Report Week 14
Geographic Spread Level is Widespread
04/13/2017 PDF Download
Flu Report Week 15
Geographic Spread Level is Regional
04/20/2017 PDF Download
Flu Report Week 16
Geographic Spread Level is Sporadic
04/27/2017 PDF Download
2016 Weekly Surveillance Reports
Title Date Type
Flu Report Week 40
Geographic Spread Level is No Activity
10/18/2016 PDF Download
Flu Report Week 41
Geographic Spread Level is Sporadic
10/20/2016 PDF Download
Flu Report Week 42
Geographic Spread Level is No Activity
10/26/2016 PDF Download
Flu Report Week 43
Geographic Spread Level is No Activity
11/02/2016 PDF Download
Flu Report Week 44
Geographic Spread Level is No Activity
11/09/2016 PDF Download
Flu Report Week 45
Geographic Spread Level is No Activity
11/16/2016 PDF Download
Flu Report Week 46
Geographic Spread Level is Sporadic
11/23/2016 PDF Download
Flu Report Week 47
Geographic Spread Level is Sporadic
12/01/2016 PDF Download
Flu Report Week 48
Geographic Spread Level is Sporadic
12/08/2016 PDF Download
Flu Report Week 49
Geographic Spread Level is Sporadic
12/15/2016 PDF Download
Flu Report Week 50
Geographic Spread Level is Sporadic
12/22/2016 PDF Download
Flu Report Week 51
Geographic Spread Level is Sporadic
12/28/2016 PDF Download
Flu Report Week 52
Geographic Spread Level is Local
01/04/2017 PDF Download
Sentinel ILINet Surveillance

This surveillance data is based upon reports submitted by ILINet - a nationwide group of medical offices that act as influenza sentinels. Sentinel providers report the number of patients with an influenza-like illness (ILI) seen by their practices each week. The aggregated ILI data are analyzed as part of our monitoring of statewide ILI activity.

Ten medical practices located throughout the state currently partner with the Health Department as sentinels, with at least one practice located in each of the state’s five influenza surveillance regions.

Join ILINet — Medical professionals in family practices, internal medicine offices, urgent care centers, emergency rooms, college student health centers, and pediatric practices are invited to join ILINet. Complete the sentinel provider recruitment form or call (802) 863-7240.

 

Laboratory Testing

The Health Department Laboratory tests specimens for influenza to identify exactly which strains are currently causing illnesses in the state.

Institutions experiencing outbreaks of influenza-like illness or providers with special circumstances will be provided with free influenza specimen collection kits and testing.

If your facility is experiencing an influenza outbreak, please call the Health Department at (800) 640-4374 or (802) 863-7240. See lab testing information

Geographic Spread

Influenza data is collected and analyzed each week by the Vermont Department of Health to determine the estimated level of geographic spread of flu in the state. This data is communicated to CDC each week through the State and Territorial Epidemiologists Reports. The geographic spread of influenza activity is defined as follows:

No Activity: No laboratory-confirmed cases of influenza and no reported increase in the number of cases of ILI.

Sporadic: Small numbers of laboratory-confirmed influenza cases or a single laboratory-confirmed influenza outbreak has been reported, but there is no increase in cases of ILI.

Local: Outbreaks of influenza or increases in ILI cases and recent laboratory-confirmed influenza in a single region of the state.

Regional: Outbreaks of influenza or increases in ILI and recent laboratory confirmed influenza in at least two but less than half the regions of the state with recent laboratory evidence of influenza in those regions.

Widespread: Outbreaks of influenza or increases in ILI cases and recent laboratory-confirmed influenza in at least half the regions of the state with recent laboratory evidence of influenza in the state.