Seasonal flu activity has surged across the United States, according to data from the Centers for Disease Control and Prevention (CDC). As of the week ending December 13, 2023, there was a notable 14.8% increase in positive influenza tests, alongside a 4.1% rise in visits to healthcare providers for respiratory illnesses. The CDC has reported three pediatric deaths from the flu this season, with two of these fatalities occurring in the most recent reporting week.
The last flu season saw a total of 287 pediatric deaths, the highest recorded since the 2009-2010 season, which was significantly impacted by the H1N1 virus that caused an early onset of flu activity. Presently, five states are experiencing very high levels of flu activity, while another ten states report high levels, highlighting a growing concern across the nation.
Understanding Flu Activity Levels
The CDC measures flu activity levels by analyzing the proportion of outpatient visits for “influenza-like” illnesses. These levels are determined by comparing the average percentage of visits during flu season against weeks with no influenza cases. Such data is crucial for assessing public health responses and preparedness.
In addition to rising case numbers, a new strain of the influenza A virus, identified as subclade K, has emerged this season. This variant has already contributed to early surges of flu cases in countries such as the United Kingdom, Canada, and Japan. Laboratory reports indicate that during the week ending November 29, most of the flu cases were attributed to the influenza A virus, with almost 90% of those tested from September 28 to November 29 identified as the new variant.
Public health officials encourage individuals to remain vigilant and consider vaccination as a preventive measure against the flu. As the flu season progresses, monitoring these trends becomes increasingly important for safeguarding community health.
