Zac Efron was "rushed to hospital" after finding himself in a "life or death medical emergency", it has been reported by various publications.
According to The Sunday Telegraph, the actor, 32, was flown to Australia from Papua New Guinea by a medical evacuation crew after contracting a "form of typhoid or similar bacterial infection" just a few days before Christmas.
Efron was said to be in a "stable" condition when he was admitted to St Andrews War Memorial Hospital where he was kept for a week.
It has also been reported that he was given the "all clear" by doctors following a medical assessment.
Efron was in Papua New Guinea filming a new reality TV show called Killing Zac Efron.
According to The Hollywood Reporter, the series would see the High School Musical star go "deep into the jungle of a remote, dangerous island, falling off the grid for 21 days".
Efron's latest project comes after he stunned viewers with his portrayal as notorious serial killer Ted Bundy in Netflix's Extremely Wicked, Shockingly Evil and Vile earlier this year:The adventure series is said to star and be executive produced by Efron, who would leave behind all luxuries and survive with nothing but basic necessities and a partner to guide him.
"I tend to thrive under extreme circumstances and seek out opportunities that challenge me on every level," Efron said per E! News. "I am excited to explore any uncharted territory and discover what unexpected adventure awaits!"
Just four days before Christmas, tour guide Cyril Tara posted pictures with the actor as he took him to Kamanibit Village. They arrived at the village by canoe before traveling on to Pagwi Village. "I am very happy to be is guide,' wrote Tara on December 7 as he posed for a picture with Zac.