A new flu strain, A(H3N2) subclade K, is driving a surge in cases across Europe, including the UK, placing healthcare systems under severe pressure, the World Health Organization has said. At least 27 of 38 countries in WHO's European region report high or very high influenza activity, with over half of patients with flu-like symptoms testing positive in six countries, including Ireland, Serbia, Slovenia, and the UK.
The WHO noted the flu season began roughly four weeks earlier than usual, with the new variant accounting for up to 90% of confirmed cases in the region. However, it stated there is no evidence that the strain causes more severe disease. Hans Henri Kluge, WHO regional director for Europe, said: 'Flu comes around every winter, but this year is a little different. It shows how just a small genetic variation in the flu virus can place enormous pressure on our health systems.'
Early data from the UK confirms that the flu vaccine lowers the risk of severe illness from the A(H3N2) strain, though it may not prevent infection. The WHO emphasised vaccination remains the most important preventive step, especially for older adults, those with underlying conditions, pregnant women, children, and health workers. School-age children are the primary drivers of community spread, but adults aged 65 and older constitute the majority of severe hospitalisations.
Kluge warned of misinformation and urged the public to seek credible information from trusted sources. He said the flu season is expected to peak in late December or early January but stressed it does not represent the level of global emergency seen during the Covid-19 pandemic. The UK's NHS has said it is bracing for one of its worst winters on record amid mounting pressure on GP surgeries, hospitals, and ambulance services.
