Unmasking the 'Asymptomatic' COVID-19: A Nose Question

Area of Science:

• Virology
• Infectious Diseases
• Diagnostic Medicine

Background:

• The rapid spread of severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) is facilitated by asymptomatic carriers.
• Accurate and rapid diagnosis of coronavirus disease 2019 (COVID-19) is crucial for pandemic containment.
• The olfactory system is frequently affected in COVID-19 patients, with the nasal cavity serving as a primary entry point for the virus.

Purpose of the Study:

• To evaluate the effectiveness of olfactory threshold testing combined with physiological parameters in identifying asymptomatic SARS-CoV-2 carriers.
• To compare olfactory function and physiological markers between asymptomatic COVID-19 positive individuals and healthy controls.

Main Methods:

• Olfactory threshold testing was performed on subjects undergoing traditional molecular testing for COVID-19.
• Heart-lung parameters (heart rate, breathing rate, blood pressure) were monitored concurrently.
• Results were compared between asymptomatic positive cases and healthy controls.

Main Results:

• A significant difference in olfactory scores was observed between asymptomatic COVID-19 positive subjects and healthy controls.
• 82% of asymptomatic positive individuals exhibited olfactory impairment, with 46% experiencing severe hyposmia and 7% anosmia.
• Control subjects showed significantly lower rates of olfactory impairment (9% severe hyposmia, 0% anosmia).
• Variations in heart rate, breathing rate, and blood pressure correlated with olfactory findings.

Conclusions:

• Olfactory testing, especially when coupled with physiological parameter assessment, shows promise as a rapid screening tool for asymptomatic SARS-CoV-2 infection.
• Mass olfactory rapid threshold screening could help identify asymptomatic individuals for further diagnostic testing, thereby aiding pandemic control.