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US flu activity fell for a second week. But experts worry the season is far from over

FILE - A certified medical assistant holds a syringe for a flu vaccine at a clinic in Seattle, on Wednesday, Sept. 10, 2025. (AP Photo/Lindsey Wasson, File)
Lindsey Wasson/AP
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AP
FILE - A certified medical assistant holds a syringe for a flu vaccine at a clinic in Seattle, on Wednesday, Sept. 10, 2025. (AP Photo/Lindsey Wasson, File)

Health experts say the U.S. flu season appears to be waning with two straight weeks of decline in measures of flu activity. In South Carolina, the state's Department of Public Health is reporting 45 flu-related deaths this season.

The U.S. flu season appears to be waning with two straight weeks of decline in measures of flu activity, according to the latest government data released Friday.

The Centers for Disease Control and Prevention (CDC) posted data — for flu activity through last week — that showed a big drop in flu hospitalizations and a smaller but significant decrease in medical office visits due to flu-like illness.

The number of states reporting high flu activity also fell — from 44 to 36.

20 new flu-related deaths were reported in South Carolina last week, according to an update by the state's Department of Public Health. DPH confirms 45 deaths associated with the flu in the state this season.

CDC officials are calling the current respiratory virus season “moderate.” But that doesn't mean the season is over, especially for flu. Second surges in flu activity often occur after the winter holidays.

“We've had other seasons where we've had a peak, it's gone down, but we've nonetheless had a prolonged season," said Dr. William Schaffner, an infectious diseases specialist at Vanderbilt University in Tennessee.

“Most of us are crossing our fingers,” he added. ”But I don't think we can rely on the concept that flu is abating very early this year."

Medical experts have worried about this season because it has been dominated by a kind of flu virus, called A H3N2, that historically causes the most hospitalizations and deaths in older people.

Even more concerning, about 90% of the H3N2 infections analyzed this season were a new strain that differs from the version accounted for in this year’s flu shots.

So far this season, there have been at least 18 million flu illnesses and 230,000 hospitalizations, according to the CDC. The agency also estimates there have been 9,300 deaths from flu so far, including at least 32 children. For those children whose vaccination status is known, 90% were not fully vaccinated against flu.

For the latest information on the flu in South Carolina, visit DPH's website.

Susan O’Cain is a dynamic and results-driven communications and operations leader with nearly 30 years of experience in strategic communications, public relations, tourism development, and organizational leadership. She currently serves as Digital Content Editor & Reporter for South Carolina Public Radio.