Nearly a quarter of patients who suffered from coronavirus odor loss did not see it return two months later, new study finds.
- Researchers looked at data from 2,581 patients from 18 European hospitals
- Discloses that 24.1% did not regain their smell and taste within 60 days of infection
- But senses returned in 95% of patients within six months of infection
Loss of senses, smell and taste are common symptoms of Covid-19, and new data shows that 86 percent of people with mild cases suffer from it.
Only 4.5 percent of people with moderate cases and 6.9 percent in severe to critical cases say they have these symptoms.
The Paris Saclay University study also shows that for a quarter of people (24.1 percent), their smell and taste do not return within 60 days of infection.
But the vast majority (95 percent) of all patients regain their sense of smell six months after infection.
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Paris Saclay University study reveals that for nearly a quarter of people (24.1 percent) their smell and taste did not return within 60 days of infection
The numbers vary depending on whether the symptom is reported by the patient himself or the doctor.
Objective clinical evaluations found a loss of odor in 54.7 percent of the mild cases of COVID-19 and 36.6 percent of the moderate to critical cases of COVID-19.
And two months later, almost a quarter of the patients still suffered from a lack of odor, also known as anosmia.
Researchers examined anonymous data from more than 2,000 people in 18 different European hospitals.


Objective clinical evaluations found a loss of odor in 54.7 percent of the mild cases of COVID-19 and 36.6 percent of the moderate to critical cases of COVID-19. Researchers discovered olfactory dysfunction in more than half of mild viral infections (stock)
Professor Jerome Lechien, a lead author of the study at Paris Saclay University, said: infection. ‘
The mean duration of this ‘olfactory dysfunction’ reported by patients was 21.6 days, researchers found.
Young patients could have a higher rate of anosmia compared to older people, scientists said.
Professor Lechien added: “After two months of follow-up, 75 percent to 85 percent of patients recovered the sense of smell according to subjective and objective olfactory evaluations.
The main hypothesis underlying the higher prevalence of anosmia in mild COVID-19 would be differences in the immune response to the infection in mild and moderate to critical patients.
“Future studies are needed to determine the long-term recovery rate of COVID-19 patients.”
Study subjects were tested with 16 scent pens and analyzed for 30 and 60 days, then six months after initial infection.
Mild patients were defined as those with no evidence of viral pneumonia or hypoxia – a lack of oxygen – and who usually recovered at home, while severe cases were associated with hospitalization.
The study is published today in the Journal of Internal Medicine.