Of course covid19 can spread through the air because viral droplets can be tiny. But infection-at-a-distance has not been demonstrated. The null hypothesis shou

Of course covid19 can spread through the air because viral droplets can be tiny. But infection-at-a-distance has not been demonstrated. The null hypothesis should continue to be that infection risk is proportional to viral exposure and time. An infected person can shed billions of viral particles per day, and yet, they don't infect that many people even if they're careless. The human immune system is remarkably good and it won't get overwhelmed when exposed to only a tiny amount of viral mass. The WHO hasn't accepted the conclusions from this paper because it doesn't provide evidence that simply exhaling produces sufficient viral mass to cause infection at a distance.