An inquest into the death of an Iranian asylum seeker has heard he was genetically susceptible to the infection that killed him.

Hamid Khazaei, 24, died in a Brisbane hospital last year after his leg became infected on Manus Island.

His death raised questions about conditions and the availability of doctors and medical treatment at the Manus Island detention centre.

An autopsy report submitted to coroner Terry Ryan at a pre-inquest conference in Brisbane today said the infection was caused by a rare bacteria, which caused septicaemia.

The autopsy found Mr Khazaei suffered from chronic granulomatous, an inherited immune disease which made him susceptible to infection.

A bacteria called chromobacterium violaceum, found in soil and stagnant water, causes the infection.

It can aggressively attack internal organs after entering the bloodstream.

The infection is rare, with only about 200 reported cases in the world since the 1920s.

The hearing was told medical facilities on the island were not sufficient to treat Mr Khazaei, as there was a limited supply of antibiotics, no X-ray machine and no laboratory.

The medical facility was housed in shipping containers, where conditions were hot.

It is believed Mr Khazaei had applied a bandage to a wound on his leg a month before he died.

As Mr Khazaei's condition worsened he was placed in medical isolation, but it took three days before he was flown to hospital in Port Moresby before being transported to Brisbane, where he died.

He was buried last year in Iran's capital Tehran.

The matter will return to court in March next year.