Ok listening to WND gave me a thought. Tanya mentions a lot of trouble was gone through to get hold of her powerful antibiotics. I believe it means both the trouble to get out of the colony and the trouble the colony had in originally getting the medicine.
Where would you get such drugs? A hospital! In chapter 17 Skittles warns Angel and Kalani to stay away from Hospitals or the "doctor's places" as he calls them, because Doctors are SMART! Thus they become smart zombies by Burt's logic