Harmful viruses did not survive in Tryslmaistan, primarily due to the extra electanic energy supporting all living things, supplementing their function. In short, with such an easier cost to biology, cells become able to fend off viruses incredibly well. Barely known to earthly science, there are (will be found) a set of incredibly tiny viruses that are beneficial and symbiotic with human life, these did survive. I don't know much about them myself beyond that.
Some bacteria did survive, strains of e coli being notable, surviving symbiotically in the human gut. A few other symbiotic bacteria survived as well, frankly, I don't know them all.
Electanic energy greatly reduces the biological cost of maintaining life in complex organisms, giving them a vastly easier time of things. This permits bizarre creatures like the Jellese to exist, and greatly lengthen earthly life as well. Indeed, it becomes trivial to extend human life indefinitely, with the implantation of simple electanic focusing chips, as we have seen in To Save Her.
But this means doom to dangerous bacteria and viruses, because what defenses that cells have are vastly magnified in power. Beneficial bacteria and viruses that are accepted by the living cells of complex organisms are not affected - they are not fought against (indeed, with bacteria such as e coli, we regularly trade DNA and RNA with them).
Beyond this, Tryslmaistan is so sterile to earthly organisms, that it would be possible to do open heart surgery in the sand at a beach, washing the blood off by rinsing surgical tools in the sea, and never worry about infection at all. If one were to open the intestines in lower abdominal surgery, though, there would be great danger of sepsis.
Food never spoils in Tryslmaistan, unless it has somehow come into contact with fecal material, say from unwashed hands fresh from a messy movement.
You could leave food out indefinitely, and it would only dry out.
Jennifer Diane Reitz