coronavirus cases in the UK may have been missed due to the fact booking a test via the NHS requires the person to have one of the three "classic" symptoms of the virus.These symptoms are a new, persistent cough, a high temperature/fever or a loss of smell or taste - without showing signs of any of these three side-effects you do not qualify as eligible for a test.Researchers at King's College London have said said that by extending the list of symptoms to include fatigue, sore throat, headache and diarrhoea would aid in identifying millions of cases that would otherwise have gone undetected and potentially led to a further spread of the virus.