“On numerous cruise ships where thousands of people onboard were infected, many of the infections occurred after passengers had to isolate in their cabins even though hand hygiene was implemented,” she said.

“Therefore, the ventilation system could have spread the airborne virus between the cabins. We know that Covid-19’s predecessor, Sars.CoV-1, did spread in the air in the 2003 outbreak. Several studies have retrospectively explained this pathway of transmission in Hong Kong’s Prince of Wales Hospital as well as in healthcare facilities in Toronto, Canada.”

We have more evidence now and we must take it on board
Lidia Morawska

via Coronavirus and airborne transmission: scientists warn Australia to be on guard | World news | The Guardian