Extra-mutated ‘superflu’ sweeps Britain: NHS declares early flu crisis and warns of ‘worst winter ever’ as experts suggest wearing masks

Britain is bracing for what health officials are calling an unprecedented winter emergency, as an aggressive flu strain pushes NHS services toward overload. Hospitals throughout England, Scotland and Wales are already seeing flu patient numbers far above normal—and much earlier in the season.

The surge is driven by a mutated version of influenza A(H3N2), known as “subclade K” or the “super flu.” Specialists warn it spreads rapidly, leads to more severe illness, and makes people more susceptible to other winter viruses. Children between 5 and 14 appear to be the main source of transmission, with hospitalisations now ten times higher than at the same point last year.

NHS leaders fear the UK could face a scenario similar to Australia’s most severe flu season ever. Several hospitals have brought back mask rules in sensitive areas to protect vulnerable patients.

The UK Health Security Agency is also encouraging people to wear a well-fitted mask if they are feeling unwell, in crowded indoor places, or when visiting those at higher risk of infection.

Rising flu pressures combined with planned doctor strikes have raised concerns that the NHS could encounter difficulties “on the scale of the Covid era.” Officials are urging everyone eligible—particularly older adults and those with chronic conditions—to receive both flu and Covid vaccines promptly.

Despite climbing flu rates, there is some relief: hospital admissions for norovirus and Covid remain lower than in previous winters.

As Christmas approaches, experts say simple steps—vaccination, handwashing, and responsible mask use—can help protect families and ease strain on NHS services.