>In this way, the creation of an Earth ecosystem without microbial diseases might be possible. No. This is wrong on two fronts. First, there would be new dis

>In this way, the creation of an Earth ecosystem without microbial diseases might be possible. No. This is wrong on two fronts. First, there would be new diseases which are of the opposite chirality, obviously. There is no such thing as a real objective definition of 'disease'. There are only patterns which successfully reproduce themselves and those which do not. But whatever sort of environment constructed will essentially create its own diseases, which will infect and interfere with what we intend to create. Successful systems breed parasites. That's a truism in microbiology. Secondly, a microbe-free world would kill us. There are more bacterial cells in our body than there are cells with our own DNA. Our understanding of the importance of our microbiology to our lives is pretty meager, but it's enough to know that 'clean room' living would be nightmarish in the best case, but more likely just lethal. And if your intent is to only allow in the 'good' bacteria and viruses and funguses... that line doesn't really exist. Biology is too messy to enable those sorts of distinctions, really. Creating a 'mirror life' world might be pretty neat, but I don't think the benefit would be from eliminating microbial interference in our precious bodily fluids.