Participants were asked "How would you feel about touching this?" and rated their level of disgust on a scale of 1 (not disgusting) to 5 (very disgusting) as they viewed each image.
The photo that finished highest in the "gross-out" ratings was of a person's gums infested with live fly larvae, receiving close to a perfect score of 5. A festering wound came in second place, with a rating of 4.6.