The 2022-2023 flu season continues its early start as respiratory illness activity climbed to levels typically seen in January or February, according to a new report from the CDC.
One important measure of the season’s severity, the proportion of outpatient visits involving influenza-like illness , rose to 5.8% for the week of Nov. 6-12. The last flu season to have such high activity so early was 2009-10, when visits for flu-like illness hit 7.7% in mid-October, the CDC’s data shows. That same season, visit levels quickly dropped and were back to normal by the beginning of January.
About a year ago, the CDC changed the definition of flu-like illness to exclude specific mention of flu itself, which has brought COVID-19 and RSV into play, since with both patients often have fever plus cough or sore throat. All three viruses are being monitored by the CDC’s Outpatient Influenza-like Illness Surveillance Network, which monitors outpatient visits for respiratory illness.
Researchers in Canada reported in February that the flu virus interferes with the coronavirus that causes COVID-19 and helps prevent the coronavirus from replicating itself. The opposite is true, as well, where the coronavirus can interfere with the flu virus, the researchers reported in a study published in the journalLikewise, there is evidence that rhinoviruses, which cause the common cold, may interfere with the coronavirus.
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