One of the most compelling was an outbreak in apartment complex in South Korea, in which only residents living in apartments connected by a common
ventilation shaft were infected. All 7 affected apartments (out of a total of 200) were located along the vertical line of the shaft, suggesting a stack effect carried virus-laden aerosols into residents’ bathrooms.10
✅-3 - Would those aerosols be capable of infection? Yes -
"the primary receptor of SARS-CoV-2 for infection is understood to be ACE2 [23], which is expressed throughout the human respiratory tract, indicating that inhalation would be a compatible route of infection."