We had a cappuccino machine, I
thought my wife kept cleaning the
crispy dried milk off the steamer
spout, she thought I was doing it. A
year later, after coffee every
morning, we found out the cat was
licking it off when we were at work.
Yes, of course be cautious, especially if pregnant. But an indoor cat, even if infected when adopted, won't be contagious after 2 weeks and won't have a way to get reinfected. Outdoor, strays, and unknown cats are obviously not inherently safe.