Yep. I have heard several times here that the good old washing of hands prevents a lot of problems.

That kitten sure does sound undernourished...maybe they should rehome a few of the cats? Do any need spaying or neutering? Take the kitten to the vet for sure!

good luck on this - 12 is not necessarily too many(ask Gina!), but they have to be looked after and cared about!

hugs
Catty1