There are reports a South Brisbane guest house is under police guard after three mystery COVID cases were recorded.
It comes as an aviation worker tested positive overnight, having visited a number of locations while unknowingly infectious, with authorities working to determine the source of his infection.
The second mystery case is thought to be the wife of the aviation worker.
Further, police are currently at the South Brisbane guest house where 12 people are reportedly in isolation because of a COVID case which has not yet been confirmed.
There may be doubt cast over the NRL grand final this weekend if more cases are recorded.