Is the US sitting on the brink of another brutal flu season? Shutdown significantly disrupts national flu tracking; Influenza is no joke, says Hopkins epidemiologist

Influenza activity is rising across the US, and public health experts are preparing for the possibility of another harsh flu season. Last year's unexpectedly severe flu wave caught the nation off guard, and early surges now appearing in Japan and the UK are adding to concern, reported Scientific American. Some of the unusual activity abroad may be tied to a mutated strain known to cause more serious illness. These international warning signs, coupled with disruptions in US flu surveillance and falling vaccination rates, have scientists on alert as they watch for signals that another difficult flu season may be looming.

US SHUTDOWN DISRUPTS NATIONAL FLU TRACKING

The government shutdown has significantly disrupted national flu tracking, leaving major gaps in the data normally used to detect early surges and identify dangerous trends. Public health experts warn that this blind spot could delay critical responses if cases spike. A CDC spokesperson told Scientific American that while data continued to be collected during the shutdown, the agency paused publication of its weekly flu reports and respiratory dashboard updates from September 20 to November 8.


"Influenza is no joke," Shaun Truelove, a Johns Hopkins University epidemiologist in infectious-disease, cautioned, as quoted by the Scientific American, stressing that "Right now it's time for everybody to get vaccinated."

Truelove notes that this gap came during a critical window for tracking flu activity. Officials and researchers typically intensify surveillance in October, he said, because understanding early trends and how quickly cases rise is essential for gauging the potential strain on health care systems.

Flu season in the Northern Hemisphere usually starts in October and reaches its peak between December and February. According to the CDC's most recent weekly report, flu activity in the US remains low but is beginning to climb, reported Scientific American.

H3N2 K STRAIN RAISES CONCERN IN US

According to Scientific American, Physician Robert Hopkins, medical director of the National Foundation for Infectious Diseases, says that among the relatively few flu samples genetically analyzed so far, more than half of the H3N2 strains belong to subclade K - a new variant first detected in Europe this summer and now driving surges in several countries.

Early warning signs are emerging worldwide: Australia recorded a near–record flu season with cases up almost 11% from last year, Japan declared an early 'flu epidemic' in October, and multiple European nations, including the UK, are reporting rising cases, with Britain seeing flu arrive a month early.

According to Scientific American, preliminary data from Japan and the UK show the mutated H3N2 K strain in 90% of samples. H3N2 generally mutates faster than H1N1 and influenza B and is linked to higher hospitalization and death rates.

Hopkins says it’s too soon to know whether the K strain will cause more severe disease in the US, but it has increased his concern. Health officials are also monitoring for potential international spread through major US travel hubs as the holiday season approaches.