Experts have warned that four Covid symptoms often get dismissed, causing cases to be missed.

While a number of coronavirus symptoms have been reported, the official NHS symptoms are a high temperature, a new and continuous cough and a loss or change to your sense of smell or taste.

However, researchers at King’s College London (KCL) have said that extending the list of symptoms to include fatigue, sore throat, headache and diarrhoea would allow “millions of cases” that have gone unconfirmed to be detected.

The findings, published in the Journal of Infection, are based on data from 122,000 UK adult users of the Zoe Covid Symptom Study app who underwent PCR swab testing, reports Wales Online.

Professor Tim Spector, lead scientist on the Zoe app and professor of genetic epidemiology at King’s College London, said: “We’ve known since the beginning that just focusing testing on the classic triad of cough, fever and anosmia misses a significant proportion of positive cases.

“We identified anosmia as a symptom back in May and our work led to the Government adding it to the list; it is now clear that we need to add more.

“By inviting any users who log any new symptoms to get a test, we confirmed that there are many more symptoms of Covid-19.

“This is especially important with new variants that may cause different symptoms.

“For us, the message for the public is clear: if you’re feeling newly unwell, it could be Covid and you should get a test.”

Scientists at KCL teamed up with the Coalition for Epidemic Preparedness Innovations (Cepi) to analyse data from 122,000 users, 1,202 of whom reported a positive PCR test within a week of first feeling ill.

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They found that testing people with any of the three classic symptoms would have spotted 69 per cent of symptomatic cases, with 46 people testing negative for every person testing positive.

But the researchers said that extending the list of symptoms to fatigue, headache, sore throat and diarrhoea in the first three days of illness would have detected 96% of symptomatic cases – with 95 testing negative for every positive test.

In addition, the researchers found that 31 per cent of people who are sick with the deadly virus do not have any of the classic symptoms in the early stages of the disease.

Dr Jakob Cramer, head of clinical development at Cepi, said: “Accurate diagnosis of Covid-19 cases is crucial when assessing the efficacy of Covid-19 vaccine candidates in large-scale studies, especially since the signs and symptoms associated with the disease are extensive and overlap with other common viral infections.

“The findings of this study provide important insights that will help optimise the choice of triggering symptoms for diagnostic work-up in Covid-19 vaccine-efficacy trials.

“We hope the findings of this study will not only aid Cepi’s Covid-19 vaccine development partners but also the wider R&D community.”

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