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Adults with Chronic Conditions plus icon.

Who is at Higher Risk of Flu Complications plus icon.

2021-2022 Preliminary In-Season Burden Estimate.

Reconstruction of the 1918 Influenza Pandemic Virus.

Understanding Influenza Viruses plus icon.

CDC is not responsible for the content of the individual organization web pages found at these links.Ī description of the CDC influenza surveillance system, including methodology and detailed descriptions of each data component is available on the surveillance methods page. These links do not constitute an endorsement of these organizations or their programs by CDC or the Federal Government, and none should be inferred. Īny links provided to non-Federal organizations are provided solely as a service to our users. The most up-to-date influenza information from the United Kingdom is available from Public Health England. The most up-to-date influenza information from Canada is available in Canada’s weekly FluWatch report. The most up-to-date influenza information from Europe is available from WHO/Europe and the European Centre for Disease Prevention and Control.

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View Chart Data (current season only) | View Full ScreenĪdditional influenza surveillance information from participating WHO member nations is available throughįluNet and the Global Epidemiology Reports.Īustralia, China, Japan, the United Kingdom, and the United States (CDC in Atlanta, Georgia) * Effective Octo(week 40), the ILI definition (fever plus cough or sore throat) no longer includes “without a known cause other than influenza.” Multiple respiratory viruses are co-circulating, and the relative contribution of influenza virus infection to ILI varies by location. Nationwide during week 25, 1.8% of patient visits reported through ILINet were due to respiratory illness that included fever plus a cough or sore throat, also referred to as ILI. Information about other respiratory virus activity can be found on CDC’s National Respiratory and Enteric Virus Surveillance System (NREVSS) website.

CDC is tracking the COVID-19 pandemic in a weekly publication called COVID Data Tracker Weekly Review. Therefore, it is important to evaluate syndromic surveillance data, including that from ILINet, in the context of other sources of surveillance data to obtain a complete and accurate picture of influenza, SARS-CoV-2, and other respiratory virus activity.

Due to the COVID-19 pandemic, health care-seeking behaviors have changed, and people may be accessing the health care system in alternative settings not captured as a part of ILINet or at a different point in their illness than they might have before the pandemic. Outpatient Influenza-like Illness Surveillance Network (ILINet) monitors outpatient visits for influenza-like illness, not laboratory-confirmed influenza, and will therefore capture respiratory illness visits due to infection with any pathogen that can present with similar symptoms, including influenza, SARS-CoV-2, and RSV. Outpatient Respiratory Illness Surveillance results of tests from Public Health Laboratories Viruses known to be associated with recent live attenuated influenza vaccine (LAIV) receipt or found upon further testing to be a vaccine virus are not included as they are not circulating influenza viruses. Data from public health laboratories are used to monitor the proportion of circulating viruses that belong to each influenza subtype/lineage. The results of tests performed by public health laboratories nationwide are summarized below.