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Asymptomatic Carriers or "Silent Spreaders" may experience no symptoms of infection other than loss of smell. (2)
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Optimist Screening identifies approximately 73% of Covid-Positive Asymptomatic persons by confirming loss of smell. (3)
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Asymptomatic carriers are just as contagious as symptomatic carriers (4) and asymptomatics do not experience fever, so temperature scans are ineffective.
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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)