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The CDC has designated loss of smell as a symptom of COVID-19 (1)

      • Asymptomatic Carriers or "Silent Spreaders" may experience no symptoms of infection other than loss of smell. (2)

      • Optimist Screening identifies approximately 73% of Covid-Positive Asymptomatic persons by confirming loss of smell. (3)

      • Asymptomatic carriers are just as contagious as symptomatic carriers (4) and asymptomatics do not experience fever, so temperature scans are ineffective.

      • Acute loss of sense of smell needs to be considered globally as a criterion for self isolation, testing and contact tracing in order to contain the spread of COVID-19. (13)

Up to 80% of people who test positive for Covid-19 complain of loss of smell (2, 5, 6, 7)

Loss of smell can be the first or only sign of infection and usually precedes other common symptoms (5)

For Covid-19 patients, loss of smell is 10 times more prevalent than fever or cough (8)

100% of Asymptomatic Carriers are infecting others without even realizing it (7, 9)

Scientific evidence points to screening for loss of smell as a tool for early indication of COVID‑19.

Measuring people for smell loss may become as routine as measuring body temperature for fever.

The diagnostic value of detecting sudden smell loss among asymptomatic COVID-19 patients in early stage: The possible early sign of COVID-19

  • The implications of silent transmission for the control of COVID-19 outbreaks.


Recent loss of smell is a highly specific COVID-19 symptom and should be considered more generally in guiding case isolation, testing, and treatment of COVID-19

  • Dr. Richard Doty, the Director of the Smell and Taste Center at Penn Medicine - University of Pennsylvania Health System, discusses various topics related to losing your sense of smell during COVID-19.

  • COVID-19 patients are 27 times more likely to have smell loss but are only around 2.2 to 2.6 times more likely to have fever, cough or respiratory difficulty, compared to patients without COVID-19.


DIfference between flu and Covid19: the loss of taste or smell.

Loss of smell (Anosmia) has been added to the list of symptoms related to Coronavirus infection.

Asymptomatic transmission of coronavirus on aircraft.


Five things to know about smell and taste loss in Covid-19: Q&A session with Dr. Justin Turner, MD, PhD, Associate Professor of Otolaryngology– Head and Neck Surgery and Medical Director of Vanderbilt University Medical Center’s Smell and Taste Center.

Researchers are calling for quick tests that cost only about a dollar each, and which may not be as accurate but can be carried out several times a week by the whole population.

  • Scientists are now beginning to understand why Covid-19 makes people lose their sense of smell.  


Smell-Loss survey suggests COVID-19 widespread in healthcare workers.

The emergence of evidence that suggests that COVID-19 frequently impairs the sense of smell.

  • Scientists are now beginning to understand why Covid-19 makes people lose their sense of smell.  


How viruses like the coronavirus can steal our sense of smell: Interview with Zara Patel, MD, a Stanford associate professor of otolaryngology, head and neck surgery, and director of endoscopic skull base surgery.

  • British ear, nose and throat doctors, citing reports from colleagues around the world, called on adults who lose their senses of smell to isolate themselves for seven days, even if they have no other symptoms, to slow the disease’s spread.

Stat News provides information on why temperature checks are a flawed method used to flag coronavirus and how smell screening is a valuable addition to testing and early detection.  

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