In a new study, researchers have called for the immediate use of additional COVID-19 symptoms to detect new cases, reduce infections and save lives.
They discussed how the loss of taste and smell—anosmia—should form part of screening measures for the virus.
The research was conducted by King’s College London scientists.
As countries slowly emerge from lockdown measures, it is imperative to correctly contact-trace infected individuals.
The team believes that having added loss of smell and taste to the list of COVID-19 symptoms is of great value as it will help to trace almost 16% of cases that otherwise would have been missed.
The team previously reported that loss of smell and taste is a key predictor of COVID-19 in addition to the most established symptoms of high temperature and a new, continuous cough.
The relative importance of the extra symptom was however disputed by sections of the UK government when it announced it was including the extra symptom.
This additional analysis of the COVID Symptom Study app data and its 3.7 million users sought to quantify the clinical value of recording loss of smell in the population.
From 76,260 people with symptoms who tested positive for COVID-19 up to 19 May, 28.5% never reported any fever or cough and 16% reported loss of smell but no fever or cough.
The prevalence of loss of smell and taste was three-fold higher in individuals testing positive (65%) than in those testing negative (22%), the strongest single predictor of being infected, suggesting that people with loss of smell and taste should self-isolate for at least seven days or until they can be tested.
The researchers believe that loss of smell and taste is a very common COVID-19 symptom and in fact, occurs more often than fever and lasts longer (5 days on average compared to only 2 for fever).
Infections could be reduced, and lives saved now that this non-flu-like symptom is widely recognized, and actions are taken.
The researchers suggest that policymakers should consider these findings and their implications for mass screening as part of other public health measures in key areas such as schools, hospitals, airports, and care homes.
The lead author of the study is Professor Tim Spector.
The study is published in The Lancet.
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