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Inactivation of coronavirus during ozone treatment under high RH. Comparison of mean (±SD, n = 3) titres of MHV recovered from contaminated carriers subjected to ozone treatment (≥7.3 ppm, red lines) and untreated (black lines) at 49.8–54.2% RH (high RH). The vertical dotted line represents the end of drying and beginning of O3 treatment, and the horizontal dotted line represents 4 logs virucidal efficiency threshold with respect to the initial titre.
