COVID-19 and flu are co-circulating this year for the first time and those who catch both are twice as likely to die, early evidence suggests, amid fears of a “twindemic”.

Jenny Harries, chief executive of the UK Health Security Agency (UKHSA), also warned that there could be multiple strains of flu ahead of an uncertain winter.

Speaking to Sky’s Trevor Phillips on Sunday, she said what is different this year is that COVID and flu are co-circulating – which increases the risk of serious illness and death.

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Jenny Harries, the former deputy chief medical health officer for England, says people should get a COVID and flu vaccine this year
Image: Jenny Harries, the former deputy chief medical officer for England, says people should get a COVID and flu vaccine this year

Asked how worried the public should be about flu this winter, she said: “We should be worried about flu each winter. I think people still don’t realise it can be a fatal disease. Recent studies suggest that about 25% of us don’t actually understand that. On average, over the last five years, about 11,000 people have died with flu-related conditions.

“But I think the important thing about this winter is, we are likely to see flu, for the first time in any real numbers, co-circulating with COVID.”

She added: “So the risks of catching both together still remain. And if you do that, then early evidence suggests that you are twice as likely to die from having two together, than just having COVID alone.

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“So I think it’s an uncertain winter ahead – that’s not a prediction it’s an uncertain feature – but we do know that flu cases have been lower in the previous year so immunity and the strain types are a little more uncertain.”

Ms Harries said it’s possible we might see “multi-strain flu” this winter after flu cases dropped to historically low levels over the pandemic.

She said there are four strains in the flu vaccine this year, “so we’ve got a pretty big array in our toolbox to hit whichever one becomes dominant, but it could be more than one this year, and people’s immunity will be lower”.

“The real trick here is to get vaccinated in both COVID and flu and continue to do those good hygiene behaviours that we’ve been practising all through COVID,” she said.

It comes as medics in the US encourage people to get both a COVID and flu shot to avoid a “twindemic” this winter.

Researchers from the Public Health Dynamics Labratory said: “Given the limited spread of influenza in the general US population last year, our research suggests that the US could see a large epidemic of flu this season. Paired with the existing threat of the highly infectious Delta variant, this could result in a dangerous combination of infectious diseases, or a “twindemic”.

Children aged 12-15 can now receive a coronavirus vaccine. File pic
Image: Children aged 12-15 can now receive a coronavirus vaccine

On average, over the past five years, about 11,000 people have died with flu-related conditions, however, the Academy of Medical Scientists have predicted that up to 60,000 could die with flu this year.

While the elderly are more vulnerable to infection and hospitalisation, Ms Harries encourages young people to take up the vaccine.

“Our highest rates of COVID at the moment are in the 11 to 14-year-olds, though that does look to be stabilising now.

“And we need to bear in mind we are proactively preventing infections in young people by offering testing to try and reduce the likelihood of infection.”

On the dominance of the Delta variant globally, Ms Harries said it has led to other strains “becoming extinct”, but warned we still need to “stay alert”.

A person wearing a protective face shield and face mask walks through Oxford Circus, amid the coronavirus disease (COVID-19) outbreak, in London
Image: Medical experts are advising people to continue taking precautions like face coverings

She later told The Andrew Marr Show on BBC One: “With the dominance of Delta, it does look as though many of the other variants which have been detected are becoming extinct, and a number of variants under investigation have risen slightly, we’ve seen cases, and they’ve become extinct.

“Now, while that holds, I think that’s right, but I don’t think it means we should be reducing our overall surveillance systems. We do need to stay alert to see.

“It’s still very early days of a new virus.”

She has also advised workers to avoid the traditional approach of “grinning and bearing illness” and instead stay away from the office if they are feeling unwell this winter.

On the subject of many people no longer working from home, she said it’s “likely we would see more cases over a short period of time” depending on what precautions people were taking like face coverings.

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