The spread of subclade K, the super flu, is picking up – and it’s not looking good for the NHS.
An average of just under 2,700 hospital beds a day in England were occupied by patients with flu last week.
There are fears that could jump to somewhere between 5,000 and 8,000 by the end of this week.
That’s on top of COVID and RSV.
And with the possibility of a five-day strike by resident (junior) doctors next week, it’s a perfect storm for hospitals.
Christmas flu
Children are the super-spreaders of flu. It races around classrooms and some schools have temporarily shut because of the impact.
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The Christmas holidays aren’t far off. They are likely to put the brakes on children passing around the virus.
But it’s also a time of year when families mix with elderly relatives, who are more likely to be hit hard by the infection – perhaps even needing hospital care.
So while the holidays may temporarily slow the overall rise in infections, the impact on hospitals could get much worse.
Subclade K
Flu is spreading so rapidly at the moment because immunity to subclade K from previous infections and vaccinations is low.
The virus – a variant of the H3N2 flu strain – suddenly acquired seven new mutations in late summer.
Every 100 people infected with seasonal flu would typically pass the virus on to 120 others.
With subclade K, it’s 140.
And that’s why cases are rising so quickly on the charts.
At the moment, 18 in every 100,000 patients in England are consulting their GP with flu-like symptoms. That’s still well short of the peak of around 50 in every 100,000 in 2017/18, the worst flu outbreak in recent years.
The grim reality of flu
Flu is a really unpleasant disease, nothing like a cold. I’ve had it twice in my life and it physically hurt to get out of bed. It’s grim.
Most people get over it with a few days’ rest and paracetamol to take the edge off the fever.
But vulnerable people can become seriously ill. In the outbreak of 2017/18, around 22,000 died.
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That’s why the NHS is urging people in certain groups – the over 65s, those with underlying health conditions, pregnant women, carers and children – to get the jab.
The vaccine isn’t a great match for subclade K, but still reduces the chance of hospital admission by 30-40% in adults.
It’s impossible to say when the spread will peak, but the latest figures suggest the outbreak is far from over.
