AUTHOR=Lechien Jerome R. , Journe Fabrice , Hans Stephane , Chiesa-Estomba Carlos M. , Mustin Vincent , Beckers Eline , Vaira Luigi A. , De Riu Giacomo , Hopkins Claire , Saussez Sven 

TITLE=Severity of Anosmia as an Early Symptom of COVID-19 Infection May Predict Lasting Loss of Smell

JOURNAL=Frontiers in Medicine

VOLUME=7

YEAR=2020

URL=https://www.frontiersin.org/journals/medicine/articles/10.3389/fmed.2020.582802

DOI=10.3389/fmed.2020.582802

ISSN=2296-858X

ABSTRACT=<p><bold>Introduction:</bold> To evaluate the recovery rate of loss of smell (LOS) with objective olfactory testing in COVID-19 patients.</p><p><bold>Methods:</bold> Adults with confirmed COVID-19 and self-reported sudden LOS were prospectively recruited through a public call from the University of Mons (Belgium). Epidemiological and clinical data were collected using online patient-reported outcome questionnaires. Patients benefited from objective olfactory evaluation (Sniffin-Sticks-test) and were invited to attend for repeated evaluation until scores returned to normal levels.</p><p><bold>Results:</bold> From March 22 to May 22, 2020, 88 patients with sudden-onset LOS completed the evaluations. LOS developed after general symptoms in 44.6% of cases. Regarding objective evaluation, 22 patients (25.0%) recovered olfaction within 14 days following the onset of LOS. The smell function recovered between the 16th and the 70th day post-LOS in 48 patients (54.5%). At the time of final assessment at 2 months, 20.5% of patients (<italic>N</italic> = 18) had not achieved normal levels of olfactory function. Higher baseline severity of olfactory loss measured using Sniffin-Sticks was strongly predictive of persistent loss (<italic>p</italic> &lt; 0.001).</p><p><bold>Conclusion:</bold> In the first 2 months, 79.5% of patients may expect to have complete recovery of their olfactory function. The severity of olfactory loss, as detected at the first Sniffin-Sticks-test, may predict the lack of mid-term recovery.</p>