On Thursday night, a NSW Health lab detected the B1.351 variant in PCR samples from the four family members who had recently flown in from South Africa. Further testing is underway to confirm the cases, but as a precaution all 16 passengers who shared their flight from South Africa to Sydney have been moved to Special Health Accommodation, where all COVID-positive travellers are quarantined. "There are concerns that this South African strain does share a similar mutation from the UK that may be associated with increased transmissibility. That is why we are taking a very cautious approach there," Dr Chant said.