The safety and accuracy of rapid tests have been thrown into doubt after more than 20 Melbourne aged care residents tested positive in the same facility.

Twin Parks Aged Care Centre in Reservoir is blaming rapid antigen tests (RATs) for the outbreak, as the Federal Government committed to deploying the ADF to help the crippled sector.

Leaked emails, obtained by 9New, have revealed the outbreak began with two infected residents, described as "extremely active" within the Twin Parks community.

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The facility then gave close contacts multiple rapid tests, but many came up negative.

A decision was made to give all residents in the home's West Wing a PCR test, the results alarmingly revealing at least 20 residents had contracted COVID-19.

Deputy Director at the Burnet Institute, Associate Professor David Anderson said RATs were not completely accurate, particularly during the early stages of infection.

"They're not a complete solution because they do miss somewhere between 20 and 50 per cent of cases especially early in infection, including when people are very infectious and can transmit the virus," he told 9News.

The centre informed families of the positive results yesterday.

Twin Parks said residents had been tested with two different brands of RATs to confirm their diagnosis, but they provided conflicting results.

The facility has had issues previously, with one email in December highlighting the inaccuracy of the tests.

"These tests are not particularly reliable, given our positive staff member tested negative on multiple RATs in the last week," it read.

When questioned about the accuracy of RATs, Prime Minister Scott Morrison admitted they were not as reliable.

"Rapid antigen tests are of course not as accurate as PCR tests," he said today.

Federal Health Minister Greg Hunt said PCR tests were preferred until the Omicron wave hit and infections rose to levels testing clinics could no longer handle.

Twin Parks has already experienced COVID-19 tragedy, with more than 20 residents dying during Melbourne's second wave.

"Facilities like this are doing their best in very trying circumstances," relative David Steart said.

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"I have confidence in the facility, not necessarily in the Federal Government."

The ADF has been sent to help medical teams and workers at aged care facilities around the country.

Mr Morrison announced today about 1700 ADF personnel would assist at facilities.

"In each state and territory, it will begin with around 50 personnel going to support each state and up to 200," he said.

The aged care sector may right now be operating 140,000 shifts a week fewer than normal, according to some reports.

The large gap is leaving residents isolated, requiring the ADF to get involved.

"An important part of your quality of life is being able to have access to your family," Mr Morrison said.

Large numbers of staff taken out of the workforce has impacted the access residents have had with family members.

Fifteen military planners will work with the Department of Health to coordinate ADF support to the aged care facilities.

The reopening of Australia's international borders has been heralded as an opportunity to re-invigorate the nation's struggling tourism and aviation sectors.

Prime Minister Scott Morrison said borders will reopen to double-vaccinated visa holders from February 21 as COVID-19 cases and ICU admissions continue to decline.

"This is the exciting announcement the aviation sector has been waiting for," Australian Airports Association (AAA) Chief Executive James Goodwin said.

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"International travel is only at 15 per cent of pre-COVID levels so this is a positive step to help the recovery of the aviation and tourism sectors."

Mr Goodwin noted domestic routes would also get a vital boost from the return of international travellers.

"International tourists don't just visit one Australian city," he said.

"They fly from state to state to see all of what our nation has to offer so it is vital all domestic borders reopen and stay open."

Qantas Group CEO Alan Joyce also welcomed today's border announcement.

"Borders reopening to international tourists means Australia is finally back open for business," Mr Joyce said.

"We will be looking at our schedules to see if we can restart flights from more international destinations sooner or add capacity to those routes we are already flying.

"We have the flexibility to ramp up flights in response to demand."

Earlier today, Mr Morrison said the government had been working to progressively re-open Australia's borders since November of 2021.

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"Those programs have proceeded very successfully – whether it was the programs we had in place with New Zealand or Singapore, and then with Japan and South Korea, opening up to international students and backpackers and economic migrants who are coming to Australia, that will now be extended to international visitors who will be able to return," Mr Morrison said.

Mr Morrison said international travellers would be welcomed back into the country, providing they were double-vaccinated against COVID-19.

"That's the rule," he said.

"Everyone is expected to abide by it and it's very important that people understand that requirement if they're seeking to come to Australia.

"If you're double-vaccinated, we look forward to welcoming you back to Australia and I know the tourism industry will be looking forward to that."

Mr Morrison said the high-profile deportation of unvaccinated tennis star Novak Djokovic "should have sent a very clear message to everyone around the world that is the requirement to enter into Australia".

Home Affairs Minister Karen Andrews said anyone not vaccinated who wants to come to Australia would have to apply for an exemption.

"They will have to provide proof that there is a medical reason that they cannot be vaccinated," she said.

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https://twitter.com/Fi_Willan/status/1490529602959122434

Ms Andrews is tipping a tourism boom for the hammered sector, almost two years after Australia closed its international borders.

Since November, when border restrictions first began to loosen for travel from a small number of countries, 300,000 people have visited Australia.

But tourism operators have been crying out for international big-spenders.

In the year 2018-19, tourism generated more than $60 billion for the Australian economy.

State-based flight caps on international arrivals and quarantine arrangements are set to continue.

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Mr Morrison said it was "up to state governments to alter those, as they see fit".

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Western Australia will move to its "high caseload settings" from tomorrow, changing the definition of COVID-19 isolation rules.

The state recorded 26 local cases of COVID-19 today, with 24 being linked to known outbreaks.

Premier Mark McGowan announced COVID-19 cases and close contacts will only need to isolate for a period of seven days.

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COVID-positive people and close contacts can be released from isolation after day seven, providing they do not have any symptoms.

Close contacts will now be defined as a household member or an intimate partner who had contact with a case; someone who had face-to-face contact with the positive case for 15 minutes where no masks were worn; or someone who spent more than two hours in a small room where a mask had been removed, as well as anyone else deemed to be due to specific circumstances determined by WA Health.

Isolation requirements for casual contacts have been scrapped.

Mr McGowan said the state had kept the virus at bay for several weeks, but the changes were necessary due to climbing infections.

"The road ahead is about to get very funky," he warned.

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"The reality is now with COVID spreading, Omicron spreading in Western Australia .. is that the road ahead is about to get very difficult.

"In many ways, the worst is still to come. We are going to get more cases."

The state will also double its international flight caps to 530 passengers, with overseas arrivals being able to leave quarantine after seven days.

It comes after Prime Minister Scott Morrison announced today Australia would reopen its borders to all international travellers as of February 21.

Mr McGowan insisted he could not abolish quarantine for international arrivals.

"If we just opened the border, it would just result in thousands of cases seeding into Western Australia," he said.

Unvaccinated arrivals will need to go into 14 days of hotel quarantine.

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Fires burning across Western Australia have impacted tens of thousands of hectares of land as reinforcements arrive from New South Wales.

A large air tanker and 36 firefighters landed in WA today to help bring the bushfires under control.

"The weather conditions will be milder today but I want to emphasise that there is still a real threat to lives and to communities and to homes," WA emergency services minister Stephen Dawson said.

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There are a number of fires in the state, but the two largest are in Denmark, in the state's south and in Bridgetown, closer to Perth.

"The incidents combined have impacted more than 60,000 hectares and currently, we have more than 1,000 personnel in attendance combatting or managing the fires," Mr Dawson said.

"I've been in a couple, but this is by far the scariest… it's gotten so close to the houses," farmer Sam Pearce, who lives in Denmark, said.

"It's relentless because the wind would change… it's almost like it was determined to burn everything there," Geoff Dowling, also a farmer, said.

A home and a shed were destroyed in Bridgetown, as well as a number of sheds at the waste facility and transfer station.

In nearby Hester, a timber treating plant has been mostly destroyed and authorities are concerned about the ash and dust blowing around, and potentially contaminating water sources.

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People have been evacuated while authorities assess the extent of the damage and determine how dangerous the ash is.

Four houses have been lost in Denmark since the blaze began.

Temperatures have dropped today but the weather is forecast to heat up again towards the end of the week.

Firefighters are hoping to get the blazes under control before then, given the Denmark fire doubled in size on Friday night in hot conditions.

Conditions are constantly changing – the best place for up-to-date information is the Emergency WA website or the Department of Fire and Emergency Services Twitter.

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A Navy SEAL candidate died on Friday and another was hospitalised in San Diego after completing a training phase known as 'Hell Week.'

The Navy said in a statement on Sunday that Kyle Mullen, 24, of Manalapan, New Jersey, died at a California hospital following the training.

The cause of Mr Mullen's death is currently unknown and is under investigation, according to the statement.

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The injured candidate is in a stable condition at Naval Medical Centre San Diego.

Neither Mr Mullen nor the injured sailor, who has not been named, were "actively" training when they began suffering symptoms, according to the Navy.

"We extend our deepest sympathies to Seaman Mullen's family for their loss," said Rear Admiral H W Howard III, the commander of Naval Special Warfare Command, in a statement.

"We are extending every form of support we can to the Mullen family and Kyle's … classmates."

NBC first reported on the incident.

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They began suffering symptoms "several hours" after the sailors' Basic Underwater Demolition SEAL (BUD/S) class had completed Hell Week and were taken for emergency medical care, according to a statement.

Hell Week is "part of the first phase of the Navy SEAL assessment and selection pathway," according to Naval Special Warfare Command.

It is considered the pinnacle of training for Navy SEALS and consists of five days in which trainees are constantly cold, hungry, sleep-deprived and wet.

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