PERTH (BLOOMBERG) - White supremacist groups including some in the United States are spreading Covid-19 vaccine misinformation online among indigenous communities in remote parts of Western Australia in order to create fear of inoculation and cause harm, state premier Mark McGowan said.

"Just now, we heard from one Aboriginal person who said white supremacist groups are sending information to Aboriginal people that they shouldn't get vaccinated," Mr McGowan told reporters on Thursday (Dec 2), the Australian Broadcasting Corp (ABC) reported.

Western Australia - one of the world's last Covid-zero policy holdouts - will keep its borders closed until the state hits a vaccination rate of 90 per cent for people aged 12 and over, a milestone it is expected to hit in late January or early February.

Mr McGowan said that even then, remote areas of the sprawling state could remain closed to visitors when the hard border is dropped, given low vaccination rates in some communities, ABC reported.

The Western Australian government last month also launched a vaccination blitz for First Nations people.

The vaccination rate in the state's indigenous communities at less than 50 per cent as at Nov 19. Statewide, the vaccination rate is now 76.6 per cent.

Online misinformation has been a constant challenge for health authorities throughout the pandemic, said the Aboriginal strategic adviser to the state's vaccine commander, Ms Wanita Bartholomeusz, ABC reported.

Some of it had been linked to faith-based organisations in the US, she said.

Federal Minister for Indigenous Affairs Ken Wyatt said last month the government had been working with the National Aboriginal Community Controlled Health Organisation and indigenous pastors from across Australia to combat misinformation and "extreme messages", many of which came out of the US.

The Australian government funded a Vax the Outback campaign to promote vaccination in remote areas.

The star of that campaign, indigenous entertainer Ernie Dingo, and his family received death threats from anti-vaccination campaigners after he participated in the inoculation push, the Sydney Morning Herald reported.

"Some of these groups, like white supremacist groups, are doing it because they want to harm Aboriginal people," Mr McGowan said. "I just urge Aboriginal people to listen to the experts, who say the vaccine is safe and effective and it will save their lives."