A diminished or loss of the sense of smell, called anosmia, has emerged as one of the telltale symptoms of Covid-19, the illness caused by the coronavirus. Of all the early symptoms, this may be the clearest signal that you’re dealing with COVID and not something else, given how rarely this occurs in other illnesses. It is the first symptom for some patients, and sometimes the only one, according to the NY Times. Often accompanied by an inability to taste, anosmia occurs abruptly and dramatically in these patients, almost as if a switch had been flipped.
Loss of smell and taste has become a calling card symptom of Covid-19. While most patients regain these senses over time, a small but growing number of patients have yet to, sparking fears that the loss could be permanent. https://t.co/GimBPkiMSI
— The New York Times (@nytimes) January 2, 2021
“Findings show that loss of smell and taste are highly reliable indicators that someone is likely to have COVID-19 and if we are to reduce the spread of this pandemic, it should now be considered by governments globally as a criterion for self-isolation, testing, and contact tracing,” Rachel Batterham, MD, study leader from University College London and University College London Hospitals, said in a statement. “People who notice a loss in their ability to smell every day household odors such as garlic, coffee, and perfumes should self-isolate and seek PCR testing.”
A recent study conducted by University College London, who studied 590 patients in the U.K. who reported suddenly losing either their sense of smell or taste; 567 of the patients were then given coronavirus tests. Their results, which were published in the journal PLoS Medicine on Oct. 1, showed that 80.4 percent of subjects reporting anosmia—aka, the loss of smell—and 77.7 percent of those who lost their sense of taste tested positive.
“There are altogether different things going on when it comes to smell and taste loss for COVID-19 patients, compared to those with a bad cold,” Carl Philpott, PhD, of the University of East Anglia’s Norwich Medical School, said in a statement on a related study. “It means that smell and taste tests could be used to discriminate between COVID-19 patients and people with a regular cold or flu.”
Scientists know little about how the virus causes persistent anosmia or how to cure it. Some experts fear that the pandemic may leave huge numbers of people with a permanent loss of smell and taste. The prospect has set off an urgent scramble among researchers to learn more about why patients are losing these senses, and how to help them.
Researchers in London hope to better understand the association between anosmia and COVID-19. Does the sudden loss of smell happen before the onset of other symptoms? https://t.co/59r345vTUR pic.twitter.com/bRcIeC5yPT
— Lawson Research (@lawsonresearch) April 27, 2020
If you find that you’ve lost your sense of smell or taste, it’s definitely time to isolate and get a COVID test. “Loss of smell and taste is a very common COVID-19 symptom and in fact, occurs more often than fever and lasts longer—five days on average compared to only two for fever,” explained Tim Spector, MS, professor of Genetic Epidemiology at King’s College London.
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