Adult individuals (> 18 years old), of both sexes, from the city of Londrina with clinical suspicion of COVID-19, submitted to testing through RT-PCR at the Sabará-Londrina Emergency Care Unit (UPA), who have no contraindications to perform mouthwash / gargle and have access to the cell phone with communication application (WhatsApp).

Adult individuals (> 18 years old), of both sexes, from the city of Londrina with clinical suspicion of COVID-19, submitted to testing through RT-PCR at the Sabará-Londrina Emergency Care Unit (UPA), who have no contraindications to perform mouthwash / gargle and have access to the cell phone with communication application (WhatsApp).