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About Influenza Surveillance
About Influenza Surveillance

Purpose of Reporting and Surveillance

  • To monitor when and where influenza activity is occurring
  • To determine what influenza viruses are circulating
  • To monitor severe influenza disease and influenza-associated hospitalizations
  • To monitor the effectiveness of vaccination programs
  • To detect emerging threats such as avian or other novel influenza virus strains
  • To measure the impact of influenza on deaths in Oregon


Influenza Surveillance Projects


Hospital Surveillance

Hospitals in the Portland metropolitan area (Clackamas, Multnomah and Washington counties) report to OPHD when they have a patient admitted with laboratory-confirmed influenza. Hospitals are asked to submit specimens to OSPHL for influenza testing. See Hospital Surveillance.

Statewide, hospitals report to OPHD when they have a pregnant woman admitted with severe influenza-associated illness (ICU admission or death) or an influenza-associated pediatric death.



Outpatient Illness Surveillance

Information on patient visits to health care providers for influenza-like illness (ILI) is collected through the Outpatient Influenza-Like Illness Surveillance Network (ILINet). ILINet consists of more than 3,000 healthcare providers nationwide who report data to CDC on the total number of patients seen and the number of those patients with ILI. Oregon sentinel providers also submit influenza specimens to OSPHL according to the Sentinel Surveillance program guidelines.

The Oregon Community Health Information Network (OCHIN) is a collaborative network of federally qualified health centers (FQHC) and rural health centers in Oregon, representing 103 clinics throughout the state. OCHIN provides discharge diagnosis data to OHA in order to monitor rates of acute respiratory illness (ARI) and influenza-like illness (ILI) among its patients.

The Influenza Incidence Surveillance Project (IISP) is a smaller program that tracks outpatient visits for ILI and collects more detailed demographic and clinical information on patients. IISP providers send specimens to OSPHL for testing for several respiratory viruses in addition to influenza.



Laboratory Surveillance

Laboratories statewide report any novel or unsubtypeable influenza virus. The Oregon State Public Health Laboratory (OSPHL) performs influenza subtyping for the above-listed surveillance projects, as well as for respiratory outbreak investigations (please contact the on-call epidemiologist at ACDP at 971-673-1111 for guidance).

See also:

Influenza-related Local Health Department Resources
Avian Influenza FAQ
Preparing for Influenza Pandemic
Influenza Disease: Other Internet Resources