While the prevalence of anosmia, hyposmia (reduced sense of smell) and dysosmia (altered sense of smell) varies between studies and different strains of the virus, existing research appears to link the prevalence of olfactory dysfunction to milder disease which may explain why it is so common. It was also reportedly the most predictive symptom of testing positive, but that has since changed with the rapid spread of Omicron, which has seen the prevalence of anosmia decrease to around one in five people who test positive. Loss of smell (anosmia) is one of the more unusual, but now widely recognised symptoms of COVID-19 infection.Īccording to data from the UK’s ZOE COVID Study, prior to the emergence of the Omicron strain it was in the top 10 most common symptoms of COVID-19, estimated to affect around 50–60% of adults infected with the virus. Researchers have uncovered a genetic link between COVID-19 infection and the likelihood of experiencing loss of smell (anosmia). New research suggests there may be a genetic link in people who experience anosmia with COVID infection.
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