The one-revolution dust trail is dust that has completed one orbit: the stream of dust released in the return of the comet prior to the current 1862 return. This mechanism replaces earlier ideas that the outbursts were due to a cloud of dust moving in a 60-year orbit.
The dust trail observed is one complete orbit around the sun. This dust originates from the previous cometary return in 1862 and replaces the notion that outbursts are due to a dust cloud traveling in a 60-year cycle.