Health and Me

Itisha Arya

Influenza A Cases Surge, Setting New Records Across US States

influenza a symptoms 2025

Flu infections are climbing across the United States at a time when holiday travel is at its peak, and New York is among the states facing the brunt of the surge. For the week ending December 20, New York recorded 71,123 positive flu cases, the highest weekly total the state has ever reported, according to the New York State Department of Health. This marked a 38 percent jump compared with the previous week.

New York is one of 14 states that logged high or very high levels of outpatient visits for influenza-like illness during the week ending December 13, data from the Centers for Disease Control and Prevention shows. High flu-like activity was also reported in Washington, DC, New York City, and Puerto Rico.

By December 16, flu cases were rising or expected to rise in 47 states, with Hawaii the only state showing a decline, according to CDC projections. Overall, the agency notes that the current level of seasonal flu activity mirrors patterns seen in several earlier years. What sets this season apart, however, is the emergence of a new flu strain. 

Experts say it is too early to determine whether the new strain is causing a higher number of infections or more serious disease. “What we do know is that cases are clearly going up, and influenza activity is increasing across much of the country,” said Andrew Pekosz, co-director of the Johns Hopkins Center of Excellence in Influenza Research and Response, during a health briefing on December 16. He added that this upward trend is expected to continue into the new year.

<h2>Influenza A Symptoms 2025: What Is The New Flu Strain Spreading In The US?</h2>

The strain drawing attention this season is subclade K, a variant of the influenza A(H3N2) virus that is now circulating widely in the United States. It has played a role in the sharp rise in flu cases nationwide, with New York reporting its highest-ever weekly count of confirmed infections. Similar increases have been seen in many other parts of the country.

Subclade K has previously driven outbreaks in Japan, the United Kingdom, and Canada, prompting questions about whether the current flu vaccine is well matched to the strain. According to USA Today, while the match may not be exact, experts believe the vaccine still reduces the risk of serious complications.

<h2>Influenza A Symptoms 2025: Fewer Americans Getting Flu Shots</h2> 

Another factor that may be fueling the rise in flu cases is a drop in vaccination rates. During the 2025–2026 flu season so far, more than 47.6 million flu shots have been administered at retail pharmacies and doctors’ offices. That figure is roughly 3 million lower than at the same point last season, CDC data shows.

The recent government shutdown, which lasted from October 1 to November 12, may also have disrupted flu surveillance and vaccination efforts. This, in turn, could have influenced vaccination uptake, said Jennifer Nuzzo, professor of epidemiology and director of the Pandemic Center at Brown University School of Public Health. Her comments were included in a flu report published on December 19 in the Journal of the American Medical Association.

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Flu infections are climbing across the United States at a time when holiday travel is at its peak, and New York is among the states facing the brunt of the surge. For the week ending December 20, New York recorded 71,123 positive flu cases, the highest weekly total the state has ever reported, according to the New York State Department of Health. This marked a 38 percent jump compared with the previous week.New York is one of 14 states that logged high or very high levels of outpatient visits for influenza-like illness during the week ending December 13, data from the Centers for Disease Control and Prevention shows. High flu-like activity was also reported in Washington, DC, New York City, and Puerto Rico.By December 16, flu cases were rising or expected to rise in 47 states, with Hawaii the only state showing a decline, according to CDC projections. Overall, the agency notes that the current level of seasonal flu activity mirrors patterns seen in several earlier years. What sets this season apart, however, is the emergence of a new flu strain. Experts say it is too early to determine whether the new strain is causing a higher number of infections or more serious disease. “What we do know is that cases are clearly going up, and influenza activity is increasing across much of the country,” said Andrew Pekosz, co-director of the Johns Hopkins Center of Excellence in Influenza Research and Response, during a health briefing on December 16. He added that this upward trend is expected to continue into the new year.Influenza A Symptoms 2025: What Is The New Flu Strain Spreading In The US?The strain drawing attention this season is subclade K, a variant of the influenza A(H3N2) virus that is now circulating widely in the United States. It has played a role in the sharp rise in flu cases nationwide, with New York reporting its highest-ever weekly count of confirmed infections. Similar increases have been seen in many other parts of the country.Subclade K has previously driven outbreaks in Japan, the United Kingdom, and Canada, prompting questions about whether the current flu vaccine is well matched to the strain. According to USA Today, while the match may not be exact, experts believe the vaccine still reduces the risk of serious complications.Influenza A Symptoms 2025: Fewer Americans Getting Flu Shots Another factor that may be fueling the rise in flu cases is a drop in vaccination rates. During the 2025–2026 flu season so far, more than 47.6 million flu shots have been administered at retail pharmacies and doctors’ offices. That figure is roughly 3 million lower than at the same point last season, CDC data shows.The recent government shutdown, which lasted from October 1 to November 12, may also have disrupted flu surveillance and vaccination efforts. This, in turn, could have influenced vaccination uptake, said Jennifer Nuzzo, professor of epidemiology and director of the Pandemic Center at Brown University School of Public Health. Her comments were included in a flu report published on December 19 in the Journal of the American Medical Association.