
Ventilation not enough: SARS-CoV-2 RNA detected in hospital air during outbreaks
A Sydney hospital study found SARS-CoV-2 RNA in 39% of aerosol air samples during two COVID-19 waves, with higher positivity in the emergency department than the ICU. Positive samples appeared in hotspots such as the ED waiting room and acute-care area, and four positives were detected before the hospital officially declared an outbreak, suggesting aerosol sampling could help with early outbreak detection. Surface contamination was low. The findings indicate that good ventilation alone may not fully prevent airborne transmission during high community activity, underscoring the value of HEPA filtration, respirators, portable purifiers, and enhanced ventilation in high-traffic areas like EDs.







