There wasn't a flu bug in the world that could keep her in bed for three days.
The flu bug could not have come at a worse time.
United have just about shaken off the flu bug and are back to more or less full strength.
But this flu bug hasn't traveled through the house yet.
The flu bug had put the whole force on extended shifts.
Unfortunately, although a good time was had by all, a number of the team picked up a strange flu bug.
You may be infected with the flu bug but don't yet have symptoms.
"I'm not thinking straight; if he had the 1918 flu bug he'd be fiat out by now."
He hoped it was a flu bug, or even the knot on his head.
He fell ill and died of another "flu bug" in July 1919.