Information about other respiratory virus activity can be found on CDCвЂ™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, COVID-19, 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 capture visits due to other respiratory pathogens, such as SARS-CoV-2, that present with similar symptoms. For regional and state level data about circulating influenza viruses, please visit FluView Interactive. Additionally, during week 44, a large backfill of data from previous weeks was received from Region 3. The majority of influenza positives reported from Michigan can be linked to a single outbreak among young adults. Among 102 A(H3N2) viruses reported for week 44, 68 (66.7%) were reported by Michigan. During the most recent three weeks, influenza A(H3N2) viruses have been reported by public health laboratories in seven of the 10 HHS regions (Regions 1, 3, 4, 5, 7, 8, and 9). Overall influenza activity is still low however, an increasing number of an influenza A(H3N2) viruses have been reported by public health laboratories in the most recent weeks.

results of tests from Public Health Laboratories 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.

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