Newshub in New Zealand reported on March 9, 2020:
Scientists in Singapore may have found a clue as to how so many people aboard cruise ship the Diamond Princess ended up getting infected with COVID-19.
It appears the virus might be able to spread through air conditioning systems.
The third room however had samples taken before cleaning, and it tested positive. Thirteen out of 15 spots in the room had positive test results for the virus - including air outlet fans.
If true, this would appear to increase the risk in many public buildings.
Can COVID-19 be caught through air-conditioning systems?