Australia's immigration detention regime is facing a crisis in healthcare staffing following the resignation of the surgeon-general of the Australian Border Force (ABF), and the departure of three senior medical staff on Nauru.

Rumours have circulated online for several days that the surgeon-general of the ABF, Dr John Brayley, who oversees the healthcare of asylum seekers in immigration detention, had resigned.

BuzzFeed News has now confirmed that the surgeon-general resigned last week. A senior immigration department source confirmed his resignation, although the department has declined to comment.

Brayley's department email now has an indefinite out-of-office message. His phone has been switched off and is no longer receiving voicemail. His Linkedin profile has also recently removed his position as surgeon-general as his current occupation.