FluSurv-NET - Influenza and RSV Surveillance

The Connecticut EIP's FluSurv-NET team conducts surveillance for severe influenza as well as severe respiratory syncytial virus (RSV) infections. Our staff work with the Connecticut Department of Public Health (CTDPH), the Centers for Disease Control and Prevention (CDC), and local hospitals to conduct these surveillance activities among residents of southern Connecticut. Together with other FluSurv-NET sites, our data provide near real time estimates of influenza severity in the US.

Stay up-to-date on CDC flu surveillance.  

Our RSV surveillance activities will provide baseline data to estimate the burden of RSV disease in patients of all ages. These data will help measure the impact of RSV medications and vaccines that are on the horizon.


In Connecticut, FluSurv-NET conducts active surveillance for influenza hospitalizations among residents of Middlesex and New Haven Counties. Cases are residents of the catchment area admitted to a hospital with a laboratory-confirmed influenza infection between October 1 and April 30. All influenza hospitalizations are reportable to the CT Department of Public Health (CTDPH) according to state statute. EIP staff act as agents of the state health department in collecting these data. EIP staff collect influenza hospitalization data directly from the hospital medical record for all cases. If insufficient information on influenza vaccine history is recorded in the medical record, then vaccine information is collected by interview.

This is a multi-site project conducted by nine other EIPs in the United States and other state health departments. Comprehensive and aggregate data analyses for this project are ongoing. Data from this system are available for use in near real time via the CDC's interactive FluView application: http://gis.cdc.gov/grasp/fluview/FluHospChars.html.

FluSurv-NET also conducts surveillance for laboratory-confirmed RSV infections among patients admitted to Yale New Haven Hospital. As with influenza, data are collected via medical record review. RSV data from Connecticut are pooled with data from other EIP sites and shared with CDC for analysis and publication.

Recent FluSurv-NET Publications

Rolfes MA, Flannery B, Chung J, O'Halloran A, Garg S, Belongia EA, Gaglani M, Zimmerman R, Jackson ML, Monto AS, Alden NB, Anderson E, Bennett NM, Billing L, Eckel S, Kirley PD, Lynfield R, Monroe ML, Spencer M, Spina N, Talbot HK, Thomas A, Torres S, Yousey-Hindes K, Singleton J, Patel M, Reed C, Fry AM, U.S. Flu VE Network, the Influenza Hospitalization Surveillance Network (FluSurv-NET), and the Assessment Branch, Immunization Services Division, Centers for Disease Control and Prevention.: Effects of Influenza Vaccination in the United States during the 2017-2018 Influenza Season. Clin Infect Dis. 2019 Feb 2; 2019 Feb 2. PMID: 30715278

Collins JP, Campbell AP, Openo K, Farley MM, Cummings CN, Kirley PD, Herlihy R, Yousey-Hindes K, Monroe ML, Ladisky M, Lynfield R, Baumbach J, Spina N, Bennett N, Billing L, Thomas A, Schaffner W, Price A, Garg S, Anderson EJ: Clinical Features and Outcomes of Immunocompromised Children Hospitalized With Laboratory-Confirmed Influenza in the United States, 2011-2015. J Pediatric Infect Dis Soc. 2018 Oct 25; 2018 Oct 25. PMID: 30358877

Chandrasekhar R, Sloan C, Mitchel E, Ndi D, Alden N, Thomas A, Bennett NM, Kirley PD, Hill M, Anderson EJ, Lynfield R, Yousey-Hindes K, Bargsten M, Zansky SM, Lung K, Schroeder M, Monroe M, Eckel S, Markus TM, Cummings CN, Garg S, Schaffner W, Lindegren ML: Social determinants of influenza hospitalization in the United States. Influenza Other Respir Viruses. 2017 Nov; 2017 Oct 6. PMID: 28872776

Arriola C, Garg S, Anderson EJ, Ryan PA, George A, Zansky SM, Bennett N, Reingold A, Bargsten M, Miller L, Yousey-Hindes K, Tatham L, Bohm SR, Lynfield R, Thomas A, Lindegren ML, Schaffner W, Fry AM, Chaves SS: Influenza Vaccination Modifies Disease Severity Among Community-dwelling Adults Hospitalized With Influenza. Clin Infect Dis. 2017 Oct 15. PMID: 28525597

Kline K, Hadler JL, Yousey-Hindes K, Niccolai L, Kirley PD, Miller L, Anderson EJ, Monroe ML, Bohm SR, Lynfield R, Bargsten M, Zansky SM, Lung K, Thomas AR, Brady D, Schaffner W, Reed G, Garg S: Impact of pregnancy on observed sex disparities among adults hospitalized with laboratory-confirmed influenza, FluSurv-NET, 2010-2012. Influenza Other Respir Viruses. 2017 Sep; 2017 Aug 1. PMID: 28703414

Appiah GD, Chaves SS, Kirley PD, Miller L, Meek J, Anderson E, Oni O, Ryan P, Eckel S, Lynfield R, Bargsten M, Zansky SM, Bennett N, Lung K, McDonald-Hamm C, Thomas A, Brady D, Lindegren ML, Schaffner W, Hill M, Garg S, Fry AM, Campbell AP: Increased Antiviral Treatment Among Hospitalized Children and Adults With Laboratory-Confirmed Influenza, 2010-2015. Clin Infect Dis. 2017 Feb 1; 2016 Nov 10. PMID: 28013261

Havers F, Sokolow L, Shay DK, Farley MM, Monroe M, Meek J, Daily Kirley P, Bennett NM, Morin C, Aragon D, Thomas A, Schaffner W, Zansky SM, Baumbach J, Ferdinands J, Fry AM: Case-Control Study of Vaccine Effectiveness in Preventing Laboratory-Confirmed Influenza Hospitalizations in Older Adults, United States, 2010-2011. Clin Infect Dis. 2016 Nov 15; 2016 Aug 2. PMID: 27486114

Oboho IK, Reed C, Gargiullo P, Leon M, Aragon D, Meek J, Anderson EJ, Ryan P, Lynfield R, Morin C, Bargsten M, Zansky SM, Fowler B, Thomas A, Lindegren ML, Schaffner W, Risk I, Finelli L, Chaves SS: Benefit of Early Initiation of Influenza Antiviral Treatment to Pregnant Women Hospitalized With Laboratory-Confirmed Influenza. J Infect Dis. 2016 Aug 15; 2016 Feb 3. PMID: 26908745

Bramley AM, Chaves SS, Dawood FS, Doshi S, Reingold A, Miller L, Yousey-Hindes K, Farley MM, Ryan P, Lynfield R, Baumbach J, Zansky S, Bennett N, Thomas A, Schaffner W, Finelli L, Jain S: Utility of Keywords from Chest Radiograph Reports for Pneumonia Surveillance Among Hospitalized Patients with Influenza: The CDC Influenza Hospitalization Surveillance Network, 2008-2009. Public Health Rep. 2016 May-Jun. PMID: 27252568

Su S, Fry AM, Kirley PD, Aragon D, Yousey-Hindes K, Meek J, Openo K, Oni O, Sharangpani R, Morin C, Hollick G, Lung K, Laidler M, Lindegren ML, Schaffner W, Atkinson A, Chaves SS: Survey of influenza and other respiratory viruses diagnostic testing in US hospitals, 2012-2013. Influenza Other Respir Viruses. 2016 Mar; 2016 Jan 29. PMID: 26505742

Hadler JL, Yousey-Hindes K, Pérez A, Anderson EJ, Bargsten M, Bohm SR, Hill M, Hogan B, Laidler M, Lindegren ML, Lung KL, Mermel E, Miller L, Morin C, Parker E, Zansky SM, Chaves SS: Influenza-Related Hospitalizations and Poverty Levels - United States, 2010-2012. MMWR Morb Mortal Wkly Rep. 2016 Feb 12; 2016 Feb 12. PMID: 26866729

Rolfes MA, Yousey-Hindes KM, Meek JI, Fry AM, Chaves SS: Respiratory Viral Testing and Influenza Antiviral Prescriptions During Hospitalization for Acute Respiratory Illnesses. Open Forum Infect Dis. 2016 Jan; 2016 Feb 12. PMID: 26885545

Related Links

Influenza Surveillance

Connecticut Department of Public Health's Influenza Statistics
Centers for Disease Control and Prevention's Weekly Influenza Surveilance Report - FluView
World Health Organization's Global Influenza Programme

Influenza Vaccine Information 

CDC Prevention and Control of Influenza with Vaccines: Recommendations of the ACIP, United States, 2018-19 Influenza Season
Connecticut Department of Public Health Immunization Program

FluSurv-News, December 2018

Project Contact Person

Kimberly Yousey-Hindes, MPH, CPH
Influenza Program Coordinator 
Connecticut Emerging Infections Program
One Church Street, 7th floor
New Haven, CT 06510
(203) 764-5942

FluSurv-Net and RSV Staff:
    Amber Maslar
    Adam Misiorski
    Christina Parisi
    Lena Tayo