🔥 Trending Influenza: Latest News and Outbreak Updates

As of mid-August 2026, influenza activity in the United States is currently low. The Centers for Disease Control and Prevention (CDC) reports that seasonal influenza activity is low across most areas of the country ¹. Estimates for the 2025-2026 influenza season have concluded as of June 5, 2026, and will resume for the 2026-2027 season ³.

While overall activity is low, it's important to monitor regional variations. Tools like Flustar.com provide a national and regional picture of influenza activity using a 12-point severity index, which is regularly updated ⁴.

Avian Influenza Concerns

Beyond seasonal human influenza, there have been recent developments regarding avian influenza. In late 2024 to early 2025, serologic evidence of highly pathogenic avian influenza A(H5N1) virus infection was found in a veterinary professional in Los Angeles County, California. This individual had been exposed to an infected domestic cat ⁶. This highlights the ongoing vigilance required for zoonotic influenza strains.

Historical Context of Influenza Pandemics

While current activity is low, influenza has a history of causing pandemics. Notable past pandemics include the 2009 H1N1 pandemic, which officially reported over 503,536 laboratory-confirmed cases and 6,250 deaths worldwide as of November 13, 2009 ⁵. The Asian Flu, caused by an H2N2 strain, is another example of a past influenza pandemic ⁵. These historical events underscore the potential for influenza viruses to cause widespread illness.

Monitoring Respiratory Illnesses

The CDC continues to monitor a range of respiratory illnesses, including COVID-19, RSV, and influenza. While RSV activity is very low in most areas, COVID-19 activity is increasing in the West and South regions of the U.S. ¹. Comprehensive data on these respiratory viruses, including national and state-level spread, is regularly updated by the CDC ². Other illnesses like measles, dengue, and MPOX are also being monitored, with their activity levels currently ranging from low to moderate ⁷.