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Weekly Influenza Activity Report

Influenza is not a reportable disease in New Hampshire, but surveillance systems are in place to help determine the extent of illness and current circulating virus types. Weekly reports are published during the traditional influenza season (beginning of October through mid-May). These reports provide data from heath care providers and laboratories, as well as data from other state and national surveillance systems. Reports also include NH influenza activity for the week, which is reported to the Centers for Disease Control and Prevention (CDC). New Hampshire participates in the US Outpatient Influenza-like Illness Surveillance Network (ILINet), a collaborative effort between the CDC, the NH Department of Health and Human Services, and health care providers throughout the State, and surveillance data reported by ILINet sentinel providers is included in the weekly reports.

Season Summary Report

Upon conclusion of the traditional influenza season, surveillance data is summarized in the form of an annual season summary report. This report summarizes the severity of the most recent influenza season, including when influenza activity peaked based on different surveillance measures, such as acute respiratory illness, number respiratory specimens that test positive for influenza (by influenza type), and the total number of influenza-related deaths. Surveillance data are summarized to determine which age groups are most affected, and data are compared to the previous influenza season as well as to regional and national surveillance data to help put the data into perspective. In addition to surveillance data presented in the Season Summary Report, information on annual vaccination rates among healthcare personnel in hospitals, ambulatory surgical centers, and assisted living facilities can be viewed by visiting the Healthcare-Associated Infections Program.

Acute Respiratory Illness (ARI) Surveillance by County & Public Health Region (PHR)

During the regular influenza season color-coded maps are generated on a weekly basis to illustrate the intensity of acute respiratory illness (ARI) for each of the counties/PHRs along with corresponding tables that list the percentage of visits to the emergency departments due to ARI.

Weekly ARI data is derived from the New Hampshire Automated Hospital Emergency Department Data (AHEDD) system which is a collaborative effort between 26 NH acute care hospitals and the NH DHHS. Each hospital electronically transmits real-time data from Emergency Department (ED) visits throughout the day to NH DHHS. Each patient encounter with chief complaint text that is ARI-related is identified using an appropriate query, and the percentage of patient visits due to ARI is calculated for each county/PHR.

Those counties or PHRs shown on the maps with coloring that is either light orange, dark orange, or red are said to have an ARI level above the established epidemic threshold.

Other Reports

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New Hampshire Department of Health and Human Services
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