The H3N2 flu strain is currently the most prevalent in England, with cases spiking much earlier this winter than in previous years. Experts are warning that it could signal the worst flu outbreak in decades, mirroring Australia's experience of its largest flu season in history this year.

This strain can sometimes cause a more severe illness, especially in older people and those with underlying health conditions. The strain also mutates regularly, meaning the dominant version circulating this year could be different from those to which people have built up immunities in previous years.

Symptoms of the H3N2 strain are similar to any other flu strain. Unlike a cold which starts gradually, flu symptoms can quickly develop.

Flu symptoms, according to the NHS :

a sudden high temperature

a

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