Is loss of smell or taste an early sign of coronavirus infection?

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A loss of smell or taste could be an early sign of infection with the pandemic virus, say doctors who cite reports from several countries.

It might even function as a useful screening tool, they say.

The idea of an epidemic infection reducing the sense of smell isn’t new. Respiratory virus infection may be a common explanation for loss of smell because inflammation can interfere with airflow and therefore the ability to detect odors. The sense of smell usually returns when the infection resolves, but during a small percentage of cases, smell loss can persist after other symptoms disappear. In some cases, it’s permanent.

Now, there’s “good evidence” from South Korea, China and Italy for loss or impairment of smell in infected people say a joint statement from the presidents of British Rhinological Society and of ENT UK, a British group that represents ear, nose and throat doctors. In South Korea, some 30 percent of individuals who tested positive for the virus have cited the loss of smell as their major complaint is otherwise mild cases, they wrote.

So that could be useful as how to identify infected people without other symptoms — fever, coughing and shortness of breath — of the new coronavirus, they wrote.

A similar proposal was published on Sunday by the American Academy of Otolaryngology-Head and Neck Surgery. It noted “rapidly accumulating” anecdotal evidence from around the world that the pandemic virus can cause not only loss of smell but also a diminished sense of taste. therefore the appearance of these symptoms in people without another explanation should alert doctors to the likelihood of a Covid-19 infection, the group said.

South China Morning Post, in an article published on Wednesday, also highlighted studies and observations in several countries that indicate significant numbers of patients experience a loss of smell.

‘No hard evidence right now’
Maria Van Kerkhove, an epidemic expert at the planet Health Organisation, told reporters on Monday that the UN health agency is looking into the question of whether the loss of smell or taste is a defining feature of the disease.

Dr. Eric Holbrook, an expert on nasal and sinus disease at the Massachusetts Eye and Ear hospital in Boston, said the reports are a hot topic among researchers and doctors. But “we don’t have hard evidence right now” about how often smell loss occurs in people infected with the pandemic virus, he said in an interview Monday.

Holbrook said the reports he has seen suggest the sense of smell returns within a few weeks, but how long it lasts has yet to be firmly established.

He also said it’s difficult to assess reports of a loss of taste because people with an impaired sense of smell often report a loss of flavor, which is technically different from an impairment in taste.

Holbrook said he’s trying to line up a study of smell in people being tested for the coronavirus at Boston-area hospitals.

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