The regional pandemic controller, Clement Totavun, has issued more control measures in step with moves by the National Control Centre.
Bougainville has increased compulsory contact tracing and Covid testing at triage centres in Arawa, Buka and Buin.
Dr Totavun said their response team will now collect swabs from any patients attending the regional clinics who exhibit flu-like symptoms.
People flying into Bougainville from other parts of PNG must have a negative test result for Covid, to be presented to officials on arrival.