West Australian authorities are bracing for further possible coronavirus cases among the crew of an infected cargo ship docked in Fremantle.
Eight crew members aboard the BBC California vessel have tested positive after displaying symptoms of the virus.
They have since been isolating in separate cabins aboard the ship.
Results are pending for a further six non-symptomatic crew members who were due to be tested on Monday afternoon.
WA's health department said the group would also receive serology tests to determine whether any had previously had the virus.
The BBC California left Egypt on June 8 and has since visited three ports in Indonesia. A number of crew members became unwell last week, prompting the ship's captain to seek assistance.
The ship docked at Fremantle Port on Monday, allowing crew members to disembark in small groups so they could be tested inside a shed.
They were met by health workers and police, clad in personal protective equipment, and returned to the ship a short time later.
Premier Mark McGowan insisted “every precaution” was taken to ensure the safety of port workers and the West Australian community.
He said anyone who needed medical treatment would be hospitalised, but doing so would increase the risk of community infection.
“If the crew can remain on board the ship and they can quarantine there, it reduces the risk to all of us,” he said.
WA Health is monitoring 15 active cases, including the eight infected crew members.
Authorities are closely monitoring the situation in South Australia, which has imposed widespread restrictions after detecting three new local cases.
WA has a hard border in place for NSW, Victoria and Queensland, but SA travellers currently do not have to quarantine unless they have been to exposure sites.
An updated list of exposure sites was published by SA Health on Monday.
“It doesn't necessitate a change to the rules at this point in time, but if we have to, obviously we will,” Mr McGowan said.
“You'd have to say of all the states in Australia, we've been the toughest on all these sorts of things to try and keep the virus out and our measures have largely worked.”