He said: "The mother came over after a few hours. She was in quite a lot of panic at the time."
Given the boy's young age, Shao decided against an endoscopy and instead waited to see whether the thermometer would be expelled naturally.
However, after two days the instrument had only moved further in to the boy's intestines, leaving the medic no choice but to operate.
Shao said: "The thermometer was lying to the right of his abdomen, so we went in with an endoscope, put it in a bag, and pulled it out of the incision."
The doctor noted it was fortunate that mercury did not spill out of the thermometer.
The boy has since been discharged and is not expected to suffer any long-term effects from the injury.
- australcope