Kiri is the first who wants to share your food. Orion is a good boy. But most of the time she steals in a relaxed way like one second "I am only interested casually." and next second "I have that piece of fish and I'm off like lightning." So we have no chance to get it back and try to eat it or keep her from eating it
In general I think whoever lives so close with cats as we do shares most of their bacteria- and obviously survives them. Maybe it helps if you tell Lily that you have bacteria too