Table 2:

Calculation of the expected concentration of SARS-CoV-2 viral load in exhaled microdroplets entering EBC under normal breathing conditions.

EBC	Moderate Emitter	High Emitter
*Expected virus yield per tidal volume	2.45 × 10−3 virions/breath	3.19 × 102 virions/breath
Total breaths over (10 – 15) min of EBC collection at median RR of 16 breaths/min 80	≥ 160 breaths	≥ 160 breaths
Expected volume of EBC collected from 10 – 15 min of normal breathing	≥ 1mL	≥ 1mL
Exhalate viral load in EBC per mL	≥ 3.92 × 10−1 copies/mL	≥ 5.10 × 104 copies/mL

^*Viral load estimations are based off of the single-compartment model by Riediker et al.,⁷⁹ tidal volume of 500 mL,⁸¹ and respiratory rate (RR) = 12 to 20 breaths/min.⁸⁰