Join Date: May 2008
Location: St. Albert, AB, Canada
It sounds to me like you're pretty safe already. The only other thing you could do (which is overkill for anything short of fleas, mites, and ringworm - IMO) would ba having special 'foster' smocks or sweats to wear that you change out of immediately after leaving the foster room.
FeLV is spread via direct contact - deep bites, mutual grooming, mother's milk (assuming the mother is FeLV+) or very rarely through sharing litter, and food/water bowls.
Basically, your cats are safe. It's a good thing to be aware of though, as you should be keeping the kittens separate from your cats until everyone is cleared for all possible communicable diseases.