Nobel Prize-winning gastroenterologist Professor Barry Marshall has been handed a spent conviction after pleading guilty to damaging a car park boom gate during an argument with attendants.

Professor Marshall entered a guilty plea to a count of criminal damage relating to an April 2019 incident at the Queen Elizabeth II Medical Centre complex in Nedlands, Perth.

The magistrates court heard that Professor Marshall became frustrated when he was unable to enter the hospital car park to drop off something at his rooms.

He admitted causing damage to the car park boom gate during the incident, but a second count of damage was discontinued. He was fined $750 and ordered to pay court costs, according to the Guardian.

Professor Marshall did his specialist training at the Queen Elizabeth II Medical Centre, where a building – the Marshall Centre for Infectious Diseases Research and Training – is now named after him.