The father of an Australian teenager who died from suspected methanol poisoning while on a backpacking holiday has issued a plea to the Laos government to fully investigate his daughter’s death and ensure such incidents don’t happen again.

The victims were an American, two Danes, two Australians, and a Brit. Australia's prime minister called the ordeal "every parent's very worst fear."

A second Australian teenager who fell critically ill after drinking tainted alcohol in Laos has died, according to a family statement sent to Australian media.