Use of Vinegar and Water to Identify COVID-19 Cases During a Workplace Entrance Screening Protocol.

Kalia, Nimisha; Moraga, Jessica Aguilar; Manzanares, Max; Friede, Vanessa; Kusti, Mohannad; Bernacki, Edward J; Tao, Xuguang Grant

OBJECTIVE To evaluate an empirical olfactory test to identify COVID-19 cases during a workplace entrance screening. METHOD An active screening for olfactory dysfunction using water and vinegar was conducted in April to June 2020 among 4120 meat packing workers in Latin America. RESULTS The sensitivity and specificity of the active olfactory screening examination were 41.2% and 85.3%, respectively, using reverse transcription polymerase chain reaction (RT-PCR) tests as a gold standard. 10.6% of employees who tested positive for COVID-19 had an olfactory dysfunction as their only symptom. These individuals would not have been identified with standard workplace screening measures including temperature screening. CONCLUSION Active screening for olfactory dysfunction may serve as a valuable tool to both identify potential COVID-19 infections and exclude those who do not have infection and should be a part of parallel algorithm combined with standard workplace entrance screening procedures.