"perhaps the most troublesome aspect is that 40-45% of individuals who are infected are without symptoms""Breathing, talking, and singing produce ~100-1,000× more aerosol particles (<100 μm) than droplets (>100 μm)""Viral half-life in aerosol is approximately 1.1 hours"
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Airborne Transmission of SARS-CoV-2: Proceedings of a Workshopin Brief | Airborne Transmission of SARS-CoV-2: Proceedings of a Workshop—in Brief | The National Academies Press
