this has been studied already in china but the rest of the world ignores. https://www.scmp.com/news/china/science/article/3074351/coronavirus-can-travel-twice-f

this has been studied already in china but the rest of the world ignores. https://www.scmp.com/news/china/science/article/3074351/coronavirus-can-travel-twice-far-official-safe-distance-and-stay https://www.scmp.com/news/china/science/article/3074351/coro...