Many businesses engage in temperature monitoring, e.g., by the use of handheld IR thermometers or IR cameras, to ensure that a visitor to the business is not running a temperature which is a sign of the visitor being a potential carrier of an infectious disease such as COVID-19. However, such detection methods are imprecise and not particularly effective if the visitor is an asymptomatic person. This disclosure describes the use of scented strips to determine if a visitor may be infected. Visitors are requested to identify the smell of a strip dispensed by an automated dispenser machine or by a human operator. Correct identification of smell serves as an indicator that the visitor is not likely infected with COVID-19.

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