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Formation of exhaled breath (A) and sampling of EBC in the cooled container (B): A – Droplets of respiratory tract lining fluid (RTLF) are released from the surfaces of the airways. A great quantity of water are released as vapor (evaporation); B – When droplets of RTLF reach the condenser, they become diluted by water vapor that are deposited on the walls of the refrigerated container (condenser).
