Forgive me for being bitchy, but I don't understand why we are still at the point of "learning". It's been on everyone's radar for almost a year, which is forever when you look at the life cycle of a virus. Microbiologists should easily have figured out all this shit months ago. They've figured out the genes and what the little proteins the genes make do. They clearly should have firm answers on just about everything - transmission, what determines mild symptoms vs ventilator, why some people are having ongoing lung problems and how to cure those and prevent future shit, exactly what kills it on surfaces or in the air, immune system response, long term immunity...basically everything. I could understand "we don't know for this virus" early on, but it's no longer early on. Science moves fast these days and they need to actually utilize the tools that exist. They need to start giving hard facts that are certain, because they've dicked around far too long with the mamby pamby "we don't know, maybe, works that way in similar viruses." If you know the genome and the purpose of the proteins it makes, you certainly should know without any doubt all likely transmission methods and how long immunity will last and what's going to sterilize everything in the personal bubble.