Experts push back on UK’s ‘superflu’ narrative as doctors set to strike

POLITICO - Monday, December 15, 2025

LONDON — A mutated influenza strain is spreading early in Europe this winter, but some experts warn talk of a “superflu” is misleading, erodes public trust and distracts from the underlying problems of the National Health Service.

The new strain has triggered dramatic headlines in the U.K., where health leaders are warning of a “worst-case scenario” for the country’s NHS. Health Secretary Wes Streeting described it as a “tidal wave of flu tearing through our hospitals” and labelled it a “challenge unlike any [the NHS] has seen since the pandemic.”

While hospital admissions have been rising sharply due to the early arrival of flu season, there is currently no evidence that this season’s variant is more deadly or transmissible, experts at the World Health Organization (WHO) and the European Centre for Disease Prevention and Control (ECDC) told POLITICO. Neither does the data suggest hospital admissions will peak higher than previous years — although this is possible — just that they’re a few weeks early.

But some experts in the U.K. have criticized the government’s “superflu” narrative, suggesting it’s being used as leverage in talks on doctor pay and conditions ahead of a looming strike.

Prime Minister Keir Starmer wrote in The Guardian Friday it was “beyond belief” doctors would consider striking in these “potentially dire” circumstances, citing “a superflu epidemic.”

The British Medical Association (BMA), the union representing resident doctors due to go on strike Wednesday, claimed it was “irresponsible to portray the current winter flu crisis as unprecedented” given that rates of infection and hospitalization were “comparable to most years,” a spokesperson told POLITICO.

Mathematician Christina Pagel, a professor at University College London, said the “superflu” line was based on the “highly misleading use of statistics” and had more to do with the impending doctors’ strike than real trends.

When contacted by POLITICO, the U.K. government stood by its health leaders’ warnings of the current flu season, in which they described it as an “unprecedented wave of super flu.” They said staff were being “pushed to the limit.” The government also pointed to stats showing the NHS is under pressure.

A DHSC spokesperson told POLITICO the government had offered the BMA an extended mandate so they could strike in January instead, but the union rejected it. The BMA told POLITICO the extension included “several restrictive conditions.”

The importance of trust

The government and NHS bosses have warned the heavy burden on hospitals in December could set the health system up for a very severe winter. NHS statistics published last week show an average of 2,660 patients in hospital with flu per day, a record for this time of year, while the Health Foundation has said the NHS could face “major pressures” if cases continue to climb rapidly in the weeks ahead.

Yet, while NHS staff are stretched, Pagel and others argue this year is largely consistent with previous severe flu seasons. However, without being clear about this with the public, some experts are concerned the government’s messaging could do more harm than good.

“One of the real issues we have with governments everywhere is trust,” Martin McKee, professor of public health at the London School of Hygiene and Tropical Medicine, told POLITICO.

While NHS staff are stretched, experts argue this year is largely consistent with previous severe flu seasons. | Geography Photos/Getty Images

“The difficulty is we’ve seen them do all sorts of things for all sorts of motives. That then becomes a problem whenever they are saying something accurate,” McKee said, adding that the government should be more careful in its flu messaging given the declining trust in science.

POLITICO put these concerns over trust in science to DHSC, but the department did not respond by the time of publication.

A spokesperson for government-sponsored NHS England told POLITICO: “The NHS is not misleading the public — this is the earliest flu season we have seen in recent years with the latest data showing the numbers of patients in hospital with flu is extremely high for this time of year.”

The NHS is struggling as it often does in winter, with a spike in delayed discharges — people who are ready to leave hospital but have nowhere to go — posing an extra challenge for hospitals, The Guardian reported Sunday.

Hospital admissions for flu per 100,000 rose 23 percent in last week’s data, compared to 69 percent the previous week, but this doesn’t rule out another surge in the weeks ahead.

McKee said the NHS was paying the price for chronic underinvestment. “We almost seem surprised that it’s arrived,” he said of the current flu wave, citing a “massive shortage” in beds, IT equipment and scanners. 

What the experts say

There is no reason to think the current flu strain (H3N2 sub-clade K) causes more severe disease than other types of flu, Hans Kluge, head of the World Health Organization’s Europe office, told POLITICO.

Nor is there any solid evidence that it is more transmissible, said Edoardo Colzani, a flu expert at the European Centre for Disease Prevention and Control. It’s possible the lower level of immunity to this strain could lead to more cases “but this is still speculative at this stage,” Colzani said.

“The epidemiological situation at the moment [in the EU] does not seem worse than in previous years apart from the fact that it is two-to-three weeks earlier,” Colzani said. Kluge said it was “about 4 weeks earlier than usual,” which “is not out of the ordinary” and trending similar to the 2022–2023 influenza season.

There were some concerns the available flu vaccine might not be a “perfect match” for the current strain, Kluge said, but early data from the U.K. suggests it provides “meaningful protection” and may prevent severe disease and death, especially among vulnerable groups.

“We [could] end up having a much bigger wave than usual but we have no evidence,” Pagel said, adding she thought it was “most likely” to peak “in a couple of weeks.” But the available data can’t tell us whether it will be a normal wave that starts and ends early, or an especially bad season, she added. 

“We don’t know when it will turn the corner but the actual shape of the wave doesn’t look that different from previous years,” McKee said.

The NHS has previously warned of the risk of a “long and drawn-out flu season” due to the early start. According to the WHO, some countries in the southern hemisphere had unusually long flu seasons this year. 

“Based on previous trends, this season is expected to peak in late December or early January,” Kluge said.

The advice from EU and U.K. authorities remains the same — get a flu vaccine as soon as possible, especially for those in a vulnerable group.