If airborne transmission is a significant factor in the pandemic, especially in crowded spaces with poor ventilation, the consequences for containment will be significant. How did the experts reach this conclusion? Reviewing existing research, the six experts from the UK, US and Canada identified 10 streams of evidence that collectively support the hypothesis that SARS-CoV-2 primarily transmits through the airborne route. 1. Super-spreading events account for substantial SARS-CoV-2 transmission. Indeed, the authors wrote, such events may be the pandemic ’s primary drivers. Detailed analyses of human behaviours and other variables in concerts, cruise ships etc have shown patterns “consistent with airborne spread of SARS-CoV-2 that cannot be adequately explained by droplets or fomites”, they wrote. 2. Long-range transmission of SARS-CoV-2 between people in adjacent rooms has been documented in quarantine hotels, but never in each other’s presence. 3. Asymptomatic or pre-symptomatic tr