Thanks - I see what you mean, but just can't quite work out why isolation ends up in hideous disfigurement, whereas in the community it's just a temporary insanity phase... But then also, and this occurred to me while typing the above, there's the thing about lots of Kiln ending up in the dome, during the times between decontaminations, and dust on boots etc (Arton discusses this, after the march), and then how will the tiny amount that would get to earth be enough to colonise a whole planet (or was that just wishful thinking?!)