Four National Rugby League match officials have been placed in a five-day quarantine after they were exposed to the H1N1 virus or Swine Flu on a flight to Canberra last weekend.
They have been replaced for round 12 games this weekend.
The four were advised by the ACT and NSW health departments that a fellow passenger on the flight had tested positive to the virus.
The four, who officiated at the Canberra versus NZ Warriors match on Sunday, were told to remain in quarantine until at least seven days after the exposure.
Referees coach Robert Finch has adjusted the round's refereeing appointments.