The High School Musical star was filming his new TV documentary series, Killing Zac Efron.
Dr Glenn McKay for the Medical Rescue Group told The Daily Telegraph: “I can’t discuss any confidential patient information. I can confirm that Medical Rescue retrieved a US citizen in his 30s from PNG to Brisbane recently for medical attention in Australia.
“He was admitted to St Andrews War Memorial Hospital in a stable condition.”
Efron’s new show sees him go deep into the jungles of a remote, dangerous island to carve his own name in expedition history”, in a Man v Wild style adventure.