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]
(..) The odds against were -to-, and he'd know that. When he did his first raise he had nothing. Winning was blind luck. -Did you get the bug? -Yes. Bet. One hundred thousand. Thank you. It's your play, Monsieur Fukutu. Maybe he can actually pull this off. (..)2006 Casino Royale