FeLV+ cat and FeLV- kitten in the same house

[Lance]

Hello all,

My mother is considering adopting a kitten that needs a home. To the  
best of my knowledge, the kitten is FeLV negative. It's only six  
weeks or so old. Right now, my FeLV+ cat, Ember, is living in my  
room, and is kept away from the others. She's had a few jailbreaks,  
but I can be much more careful with her than I have been. The other  
cats in the house tested negative with ELISA a few weeks ago (see the  
"Ember" thread for the whole story).

Anyway, I know generally what vets and others think of having a  
negative in a positive's house. I'm isolating Ember. However, the  
kitten will not have had her shots, and probably won't be ready for  
her first FeLV vax for another month. Even with Ember being isolated,  
and the kitten having no direct or indirect exposure (i.e. no one  
shares food, food bowls, boxes, water), do we run any risk of having  
the kitten come up positive just by living in the same house as my girl?

Thanks,

Lance