What is the H3N2 Flu Strain?
The H3N2 flu strain is a subtype of the influenza virus currently dominating flu cases in England. It is characterized by two surface proteins, haemagglutinin (H) and neuraminidase (N), with this particular combination sometimes causing more severe illness, especially in older adults and those with underlying health conditions. The virus frequently mutates, meaning the current version may differ from past strains or the one included in this season’s vaccine, increasing susceptibility among the population.
Symptoms of H3N2 Flu
Symptoms of an H3N2 infection usually appear suddenly and include high fever, cough, runny nose, body aches, and extreme tiredness. Unlike common colds, flu symptoms develop rapidly and can also involve vomiting or diarrhoea. High-risk groups, including children under five, adults over 65, pregnant women, and people with chronic medical conditions like asthma or heart disease, are more likely to experience severe complications.
Current Flu Case Surge in the UK
Hospital admissions for flu have surged this winter, with daily admissions rising to around 1,700 patients in England—an increase of 56% compared to the same week last year. The current admission rate is also seven times higher than at the same time in 2023. This surge follows Australia’s record-breaking flu season, which is seen as a predictor of what the UK can expect.
Why Is H3N2 More Severe This Winter?
Several factors contribute to the severity of this flu season. The season started earlier than usual, allowing longer virus circulation. The H3N2 strain has evolved with multiple mutations, reducing the protective effect of previous immunity and vaccines. Additionally, fewer people have been exposed to flu recently, especially children, leaving more vulnerable to infection. Colder weather and increased indoor social mixing facilitate faster spread.
Prevention and Vaccination Advice
Health experts strongly recommend flu vaccination, particularly for high-risk groups, stating it is the most effective way to reduce severe illness and hospitalization. Though not 100% preventive, the current vaccine shows 70–75% effectiveness in children and 30–40% in adults. Other preventive steps include frequent handwashing, wearing face masks if unwell, covering coughs and sneezes, avoiding close contact with sick individuals, and ensuring good ventilation indoors.
Managing the Risk
While most healthy individuals experience manageable symptoms, H3N2 can cause serious illness in vulnerable populations. Doctors urge vigilance by getting vaccinated early, taking sensible precautions, and seeking medical help if symptoms worsen. Public health officials emphasize that vaccination remains the best defence against this year’s challenging flu strain, helping reduce pressure on the NHS during the peak season.
Read more at: www.independent.co.uk-
-
-
-
