Loss of smell and taste validated as COVID-19 symptoms in patients with high recovery rate

“Loss of smell and taste validated as COVID-19 symptoms in patients with high recovery rate”
“Neuroscience News
14 hours ago
Summary: Study confirms sensory loss associated with taste and smell is strongly linked to early coronavirus infection. Based on the findings, people who report olfactory or taste loss are ten times more likely to have COVID-19 than other infections. Patients reported their sensory loss to be profound rather than mild. Encouragingly, the rate of sensory recovery was high, with patients reporting a return of normal smell and taste function within two to four weeks, which matches the time of disease recovery. Researchers also found people who reported sore throats more often tested negative for COVID-19.
Source: UCSD”

“Loss of smell and taste has been anecdotally linked to COVID-19 infections. In a study published April 12, 2020 in the journal International Forum of Allergy & Rhinology, researchers at UC San Diego Health report the first empirical findings that strongly associate sensory loss with COVID-19, the respiratory disease caused by the novel coronavirus.
“Based on our study, if you have smell and taste loss, you are more than 10 times more likely to have COVID-19 infection than other causes of infection. The most common first sign of a COVID-19 infection remains fever, but fatigue and loss of smell and taste follow as other very common initial symptoms,” said Carol Yan, MD, an otolaryngologist and head and neck surgeon at UC San Diego Health. “We know COVID-19 is an extremely contagious virus. This study supports the need to be aware of smell and taste loss as early signs of COVID-19.”
Yan and colleagues surveyed 1,480 patients with flu-like symptoms and concerns regarding potential COVID-19 infection who underwent testing at UC San Diego Health from March 3 through March 29, 2020. Within that total, 102 patients tested positive for the virus and 1,378 tested negative. The study included responses from 59 COVID-19-positive patients and 203 COVID-19-negative patients.
Yan said the study demonstrated the high prevalence and unique presentation of certain sensory impairments in patients positive with COVID-19. Of those who reported loss of smell and taste, the loss was typically profound, not mild. But encouragingly, the rate of recovery of smell and taste was high and occurred usually within two to four weeks of infection.
“Our study not only showed that the high incidence of smell and taste is specific to COVID-19 infection, but we fortunately also found that for the majority of people sensory recovery was generally rapid,” said Yan. “Among the Covid-19 patients with smell loss, more than 70 percent had reported improvement of smell at the time of survey and of those who hadn’t reported improvement, many had only been diagnosed recently.””
But encouragingly, the rate of recovery of smell and taste was high and occurred usually within two to four weeks of infection. The image is in the public domain.
Sensory return typically matched the timing of disease recovery. Interestingly, the researchers found that persons who reported experiencing a sore throat more often tested negative for COVID-19.
In an effort to decrease risk of virus transmission, UC San Diego Health now includes loss of smell and taste as a screening requirement for visitors and staff, as well as a marker for testing patients who may be positive for the virus.
Other known symptoms of COVID-19 include fever, fatigue, cough and difficulty breathing. Respondents in Yan’s study were most often persons with milder forms of COVID-19 infection who did not require hospitalization or intubation. The findings, she said, underline the importance of identifying early or subtle symptoms of COVID-19 infection in people who may be at risk of transmitting the disease as they recuperate within the community.
“It is our hope that with these findings other institutions will follow suit and not only list smell and taste loss as a symptom of COVID-19, but use it as a screening measure for the virus across the world,” Yan said.

Source: UCSD
Media Contacts: Jeanna Vazquez – UCSD
Image Source: The image is in the public domain.

International Forum of Allergy and Rhinology
Long-term memory performance depends upon gating system
Association of chemosensory dysfunction and Covid‐19 in patients presenting with influenza‐like symptoms
Rapid spread of the SARS‐CoV‐2 virus and concern for viral transmission by ambulatory patients with minimal to no symptoms underline the importance of identifying early or subclinical symptoms of Covid‐19 infection. Two such candidate symptoms include anecdotally reported loss of smell and taste. Understanding the timing and association of smell/taste loss in Covid‐19 may help facilitate screening and early isolation of cases.
A single‐institution, cross‐sectional study evaluating patient‐reported symptoms with a focus on smell and taste was conducted using an internet‐based platform on adult subjects who underwent testing for Covid‐19. Logistic regression was employed to identify symptoms associated with Covid‐19 positivity.
A total of 1480 patients with influenza‐like symptoms underwent Covid‐19 testing between March 3 through 29, 2020. Our study captured 59 of 102 (58%) Covid‐19‐positive patients and 203 of 1378 (15%) Covid‐19‐negative patients. Smell and taste loss were reported in 68% (40/59) and 71% (42/59) of Covid‐19‐positive subjects, respectively, compared to 16% (33/203) and 17% (35/203) of Covid‐19‐negative patients..
In ambulatory individuals with influenza‐like symptoms, chemosensory dysfunction was strongly associated with Covid‐19 infection and should be considered when screening symptoms. Most will recover chemosensory function within weeks paralleling resolution of other disease‐related symptoms.”
Source: https://neurosciencenews.com/smell-taste-covid-19-recovery-16149/

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