Researchers say the symptoms people are reporting when they have Covid-19 have changed since the emergence of the Delta variant.

The mutation of the coronavirus first seen in India is now responsible for more than 90 per cent of new cases in the UK.

Until this point people have been urged to watch for three key symptoms that could show they have contracted Covid-19.

They are a new, dry, persistent cough, a temperature and a loss of sense of taste or smell.

But leading scientists say there are new signs you should now watch for.

User-submitted research has found that a headache and a sore throat have become more common symptoms.

The change could be in part because the new variant is currently spreading among younger people, reports The Sun.

The ZOE Covid Symptom Study has been tracking the Covid outbreak since March 2020, with millions of Brits reporting their symptoms via the app.

Professor Tim Spector, the lead on the study, told The Telegraph: “Since the start of May, we’ve been looking at the top symptoms and they are not the same as they were.

“Number one is headache followed by sore throat, runny nose and fever.

“All those are not the old classic symptoms, number five is cough, so it’s rarer and we don’t even see loss of smell coming into the top 10 anymore.

“This variant seems to be working slightly differently.”

A headache affects 66 per cent of people with Covid, according to symptoms reported by app users.

Sore throat (53 per cent) and runny nose (49 per cent) follow behind.

A loss of taste or smell is no longer in the top 10 symptoms, the app has recently found.

Another leading infection survey in the UK found in February Covid is defined by symptoms of chills, loss of appetite, headache and muscle aches.

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