What do you mean by "so many"? Singapore appears to be an amazing success story in containing C19.
They are using aggressive contact tracing as part of that, so if it were spreading like wildfire through A/C vents surely that wouldn't be effective and they would have a much faster growth rate of cases.
I don't think the assertion is that it's spreading through vents, just that spending time in a very air conditioned room mimics some of attributes of winter that make the spread of respiratory viruses more likely (dry air, dry nasal passages)
cactus2093|6 years ago
They are using aggressive contact tracing as part of that, so if it were spreading like wildfire through A/C vents surely that wouldn't be effective and they would have a much faster growth rate of cases.
alonmower|6 years ago