They've been trying to work/get the 'bugs' out of the system. [=trying to fix the system's problems]
He was first bitten by 'the' acting 'bug' [=he first became interested in acting] when he was 18.
Her legs were covered in 'bug' bites. [=itchy or painful wounds from insects]
(..) in a tin shithouse. That's enough out of you. -Heard he had you shitting your pants. -Fuck you. Knock it off. Brooks ain't no bug. He's just institutionalized. "Institutionalized," my ass. The man's been in here years, Heywood, years! This is all he knows. (..)1994 The Shawshank Redemption