Study Reveals COVID-19 Spread Through Ventilation in Spanish High-Rise
A study published in PLOS One has identified that a COVID-19 outbreak in a high-rise apartment building in Santander, Spain, during June 2020, was likely spread through shared bathroom ventilation ducts. The outbreak involved 15 cases across four vertically stacked apartments connected by the same ventilation shaft. Researchers from the University of Colorado Boulder confirmed the connection between cases by sequencing virus samples and measuring air flow and pressure. The building, constructed in the late 1960s, used a natural convection system for ventilation, which can reverse air flow under certain conditions, potentially spreading virus-laden aerosols between apartments. 
