The WA Health Department has launched an investigation into how COVID-19 jumped between neighbouring rooms in hotel quarantine in Perth.
Genomic testing has shown two sets of couples on the sixth floor of the Mercure Hotel Perth had the same variant of the virus despite arriving from different countries at different times.
In a statement, the WA Health Department confirmed the two new cases, which had previously been reported as being overseas acquired.
"All other guests who previously stayed on the same (sixth) floor during this time and have been released from the hotel facility tested negative prior to release," the statement read.
"These guests will be re-tested and directed to self-isolate until cleared by the public health team."
Former Department of Communities employee hit with further child sex charges
Police, RSPCA investigate alleged bashing of dog in Baldivis
Construction tender now open for new mental health facility at Rockingham General Hospital
Secret Harbour, Coodanup, Dudley Park men charged following investigation into national drug, money laundering syndicate
Men, teens charged over Dawesville kebab shop brawl
Boy in police custody after car ploughs into Baldivis business
Prescribed burns prompt smoke alerts for North Dandalup, Preston Beach, Dawesville, Bouvard
Dozens of Rockingham residents to attend Special Electors Meeting to discuss FOGO, bin collections