Early flu season surges in England, UKHSA data shows
Flu activity in England is rising earlier than usual, with September levels exceeding those of the past four winter seasons, according to the UK Health Security Agency (UKHSA). While overall flu circulation remains low, multiple indicators—including positive test rates and GP consultations for influenza-like illness—show an upward trend that began in August. Emergency department attendances for flu-like symptoms are also above seasonally expected levels.
"Flu activity throughout September has been higher than in the same period during all past four winter seasons," UKHSA reported. The agency's first weekly winter respiratory virus surveillance report of the season, released on October 11, 2026, highlights that the increase is being driven primarily by young adults aged 18 to 24.
NHS England's national medical director, Professor Frankie Swords, described the situation as "slightly ominous" during a briefing. "The number of admissions for flu are the highest that I can remember seeing at this time of year," she said, noting that hospital admissions for flu stood at 1.97 per 100,000 for the week ending October 4. "This is coming on the back of the busiest summer we've ever had in our emergency departments; we have got very, very busy hospitals."
Hospital pressures mount as Covid also rises
The early flu uptick coincides with a gradual increase in Covid-19 cases, including the circulating XFG strain. While officials emphasize that the autumn vaccination programme targets this variant and shows no evidence of causing more severe illness, the combination of rising respiratory viruses is straining an already stretched NHS. In September, average hospital bed occupancy reached 95%, a stark figure for a month typically outside the peak winter period.
Professor Swords revealed that 3.9 million people have already received their flu vaccination since the programme began in September. The NHS started vaccinating pregnant women, toddlers and school-age children from September 1, with over-65s and other eligible adults offered the jab from October 1. Despite this, health leaders are urging all eligible individuals to get vaccinated as soon as possible.
Vaccination remains best defence against early flu season
Public health experts stress that vaccination is the most effective way to mitigate the impact of an early flu season. Professor Sir Andrew Pollard, director of the Oxford Vaccine Group, said: "There is one simple action for all those who are at risk because of age or their underlying health conditions, which is to get vaccinated as soon as possible and before we reach the peak of transmission."
Pollard noted that while everyone can benefit from vaccination, free vaccines are only available for children and those in higher-risk groups. Those not eligible for a free NHS jab may be able to access one through their workplace or privately, with costs around £20 at most high street pharmacies and under £10 through some retailer membership schemes.
The UKHSA estimates that last winter's vaccination programme in England prevented approximately 100,000 hospital admissions and 7,000 deaths. Antonia Ho, professor of infectious diseases at the University of Glasgow's Centre for Virus Research, emphasized the importance of early vaccination: "An early rise in influenza cases may indicate a more intense influenza season overall, because earlier onset is associated with a longer period of community transmission and higher cumulative case numbers."
Vaccine composition and circulating strains
There are three types of flu virus, and while it is too early to know which one will dominate this winter, the current vaccine protects against all three. Early data show an equal mix of subtypes A(H3N2) and A(H1N1) in England. UKHSA reported that the H1N1 subtype has likely changed somewhat compared with the strain used to produce this year's vaccine. However, Ho believes it is still too early to assess whether this will affect vaccine effectiveness.
"We don't know for certain why the timing varies each year," Pollard said, suggesting that an early rise is due to a combination of factors, including weather, the specific circulating strain and its transmissibility, population immunity, and behavioural patterns such as the number of close contacts people have. He added that an earlier flu season does not necessarily mean a worse season.
Why an early flu season matters for the NHS
The early arrival of flu places additional pressure on an NHS that is already grappling with unprecedented demand. The summer of 2026 was the busiest ever for emergency departments, and hospitals entered autumn with high occupancy. Professor Swords warned: "In September, on average, 95 per cent of our occupancy was used every day, and that's September. So although the weather's still nice, and perhaps people aren't thinking too much about flu at the moment, please, we are acting early, and I'd really encourage people to act early. Because winter is coming, and the pressure is going to build and rise as temperatures fall."
An early flu season also risks a longer period of community transmission, which could lead to higher cumulative case numbers and more hospitalisations. The UKHSA's surveillance will be closely watched in the coming weeks to see whether the early rise translates into a more severe season. In the meantime, health officials are urging the public to follow basic hygiene measures: stay at home if experiencing flu-like symptoms, practise hand hygiene, and avoid contact with others to reduce spread.
Vaccination uptake and eligibility
The NHS flu vaccination programme is targeting all eligible groups, including children, pregnant women, those aged 65 and over, and individuals with certain underlying health conditions. With 3.9 million vaccinations administered so far, uptake is progressing but health leaders want to see more people protected before the peak. For those not eligible for a free vaccine, private options are available at pharmacies and some workplaces, making it easier for anyone who wishes to get vaccinated.
Professor Pollard reiterated that vaccination is a shared responsibility: "Everyone can benefit from being vaccinated but free vaccines are only available for children and those in higher-risk groups." He also pointed out that workplaces may offer free jabs, and private vaccination is relatively affordable, with some retailers providing discounts through membership schemes.
Broader implications: what this early season signals
The early start to England's flu season is part of a broader pattern of unpredictable respiratory virus seasons. The UKHSA's report underscores the need for robust surveillance and rapid public health responses. It also highlights the importance of vaccination campaigns that can adapt to shifting virus strains and timing. As climate patterns and population behaviours evolve, the traditional boundaries of flu season may continue to blur.
While the current flu levels remain low, the trajectory is concerning. The simultaneous rise of Covid-19 and flu could create a "twindemic" scenario, further stretching NHS resources. The government's recent announcement of a £33.2 million investment into eight research projects aimed at protecting against future pandemic threats, such as Ebola and plague, signals a recognition of the need for pandemic preparedness. However, immediate focus remains on managing the current respiratory season.
For now, experts advise the public to remain vigilant and take proactive steps. "An early rise in influenza cases may indicate a more intense influenza season overall," Ho warned. With winter approaching, the message from health officials is clear: get vaccinated early, practise good hygiene, and help ease the pressure on the NHS.
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