Viral RNA has reportedly been discovered on return air grilles, in return air ducts, and on heating, air flow, and air con filters, but detecting viral RNA alone does not indicate that the captured virus was capable of transmitting disease. One research group reported that using a model new air-sampling method allowed them to search out viable viral particles inside a COVID-19 patient’s hospital roomexternal icon with good ventilation, filtration and ultraviolet disinfection . However, the focus of viable virus detected was believed to be too low to trigger illness transmission.
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