More than a dozen students at an Adelaide high school have been suspended after organising and filming a brawl at lunchtime.

A video shows two boys going toe-to-toe in a fight at Underdale High School yesterday in the school's sports sheds while dozens of other students watch on and film it.

9News understands it was an organised brawl. 

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A student who cannot be identified claimed it began at recess and at least one of the boys didn't want to fight.

"They have like a roster on who fights every day but I don't know if it's on paper, and they just start fighting each other," the student told 9News.

"Older kids were calling him names so he felt like he had to fight."

It comes two weeks after a statewide phone ban was introduced in South Australia but the video shows more than a dozen phones recording the fight.

Afterwards, the footage spread among students and even to parents at the school.

"(I) came across this as an AirDrop that was thrown across the school," a parent said.

"I watched it and I felt disgusted looking at it, like it's not something young kids should be doing."

Up to 18 students have been suspended as a result of the fight. 

South Australia Police visited the school today and are now investigating the incident. 

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Education Minister Blair Boyer said dummy phones are being surrendered at school gates to get around the phone ban.

"They're using the phones to orchestrate or organise the fight and the timing to record it and then distribute the footage on social media," he said.

"I expect schools to take strong action which they've done here, come down on them like a tonne of bricks which they've done here and suspended those with the phones as well."

Parents of students at the school had not been notified of the incident prior to the education minister addressing it today.

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A lot of goods have been donated and volunteers are busy sorting it out.

John Coates was an extremely well known local of the Te Karaka community.

Victoria has recorded its first human case and death from the mosquito-borne Murray Valley encephalitis virus in almost 50 years.

Health officials initially thought the woman in her 60s who died earlier this month had contracted another mosquito-borne virus, Japanese encephalitis virus.

But further testing has revealed the woman, who was from the shire of Buloke in western Victoria, had died from Murray Valley encephalitis.

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Victoria had not previously recorded a human case of the virus since 1974, but human cases were recorded in NSW and SA in 2011.

The virus was detected in animals in the Griffith area in NSW and in northern Victoria in mid-January.

Most people infected with the virus do not have symptoms, but it can cause a life-threatening infection.

Symptoms may include fever, headache, nausea, vomiting and muscle aches.

There is no vaccine or effective treatment.

Victoria's Chief Health Officer Professor Brett Sutton said has warned Victorians, particularly those in the state's north, to take steps to avoid mosquito bites,

"Simple precautions include wearing long, loose-fitting, light-coloured clothing, using insect repellents, removing stagnant water around homes or properties, and avoiding the outdoors when mosquitoes are observed, especially at dusk and dawn," he said.

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Murray Valley encephalitis virus, Japanese encephalitis virus and West Nile (Kunjin) virus have been detected in mosquitoes in several LGAs in northern Victoria this mosquito season.

People eligible for the Japanese encephalitis vaccine are urged to speak to their GP, local public health unit, local council or community pharmacist for more information.

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A vaccine to help protect babies and the elderly from the common respiratory syncytial virus (RSV) could be available in Australia in a year.

New data from the New England Journal of Medicine shows trials of the RSV vaccine are proving to be up to 94 per cent effective.

Lisa Quinn's son, Carter Fagan, caught the virus three times last year.

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She described the experience as terrifying.

"At one point I thought he was going to stop breathing and going to die in my arms," Quinn said.

She said there were multiple trips to the hospital as the virus took hold.

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"Twice he required oxygen because his levels were so low… his heart rate at one point skyrocketed to about 196 (beats per minute)."

Most infections are usually mild but babies and the elderly are most at risk from the disease.

"In babies, it manifests into a chest infection called bronchiolitis where they have trouble breathing," University of Sydney infectious diseases expert Robert Booy said.

"In the elderly it's more likely to manifest as pneumonia, fast breathing, cough fever."

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After decades of research and trials, Booy believes the vaccine will be available in a year from now.

"The good news… we've had a series of studies from a number of vaccine companies, all showing benefits over giving the vaccine to pregnant women and their unborn babies, to elderly people, to young children," Booy said.

The virus often causes outbreaks in autumn and frail Australians are the most at risk of death.

Cordons are currently in place in the area.

A grandson and his 90-year-old grandmother narrowly escaped flames from the South Australian bushfires after he saved the pair amidst the burning chaos.

Joe Stephens rescued his grandmother, Tula, by fighting through thick smoke to huddle her into his car when he realised the flames were quickly approaching their property.

"I opened the door and realised the whole paddock was on fire and I thought I'd left it too late," he said.

"It was terrifying, it was so thick and it was moving so fast, never seen anything like that.

"You could hear the roar of the fire."

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The pair were forced to drive down a no-through road to escape the flames, having to saw through a paddock gate to get them and the car through.

"Luckily I had my grinder on me and managed to cut through both the gates which essentially saved our lives."

His Grandmother called him a hero for saving them. 

"I wouldn't have been here if he wasn't here, if Joe wasn't here."

The Black plumes of smoke from the fire at Stamford Drive, Port Lincoln, which Stephens escaped, were billowing throughout the air early today and spreading potentially harmful smoke to nearby areas, authorities said.

The smoke is expected to linger until Sunday, with residents being warned to keep their doors and windows closed, set their air conditioners to recirculate, and told to stay inside. 

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The blaze started after a large grass fire spread from scrubland south of Port Lincoln overnight, reaching the waste management facility and several other industrial buildings by this morning.

While the Stephens family home was spared from the flames, six other properties and homes have been damaged by the fire, according to the SA Country Fire Service (CFS).

However, the CFS said there was no immediate threat to life but it has warned residents to remain indoors and their windows and doors closed.

"This fire is causing smoke to linger in the Eastern areas of the Lower Eyre Peninsula," the CFS said.

"The smoke being generated from the burning waste may be hazardous to your health.

"If you are in this area stay alert, monitor local conditions and decide what you will do if the situation changes."

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Motorists have also been urged to drive carefully because smoke could reduce visibility on roads.

Overnight fire crews brought under control a large fire on the Eyre Peninsula.

Dozens of firefighters battled the fire on the ground while water bombers were in the air and reinforcements from Adelaide were deployed.

The grass fire was sparked as searing heat gripped the state yesterday.

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NSW Finance Minister Damien Tudehope has resigned from cabinet barely a month out from the state election after admitting he held shares in Transurban while serving in the position.

In a statement on Friday evening, Tudehope said had resigned from his ministerial roles, although said he had been cleared of knowingly breaching the Ministerial Code of Conduct.

"Tonight I have given my resignation as the Minister for Finance, Minister for Employee Relations and Leader of the Government in the Legislative Council to the Premier," Tudehope said.

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"As outlined earlier today, my family superannuation fund was disclosed to Premier (Gladys) Berejiklian in 2019 as required under the Ministerial Code of Conduct.

"This disclosure has since been subject to continuous updating on an annual basis in accordance with the code of conduct.

"When it was brought to my attention that held within my family superannuation fund are shares in the company Transurban I took action to remove them from my fund.

"The legal advice from the Department of Premier and Cabinet has cleared me, advising I did not knowingly breach the Ministerial Code of Conduct.

"However during the course of the day I have had the opportunity to consider my position and I value my own integrity and the integrity of the government to be something that is not the subject of repeated political attacks."

Premier Dominic Perrottet said he accepted the resignation, but defended Tudehope as a "person of integrity".

"Tonight I have accepted the resignation of Finance Minister Damien Tudehope," Perrottet said in a statement.

"I have known Damien for many years and he is a person of integrity and honesty.

"At all times he has undertaken his responsibilities as a Minister with the highest of standards.

"My Department provided advice to me earlier today which cleared Damien, saying he did not knowingly breach the Ministerial Code of Conduct."

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Perrottet said he will take on the finance and employee relations portfolios until the election.

Earlier on Friday, Tudehope claimed he didn't know he held the shares, which he said were part of his family's superannuation fund.

"I did not know the Transurban shares were part of that fund," Tudehope said.

He said he complied with his obligation to the premier and disclosed the necessary information, including a printout of the fund.

"If I had known that my family's superannuation fund had shares in Transurban I would have disclosed that," he said.

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Tudehope said he had unknowingly owned the shares since 2014 and made the discovery two days ago and sold them this morning.

He said his ownership of shares did not influence any decisions regarding the NSW toll relief rebate.

"Since 2014 to today, there has been an increase in the value of those shares," he said.

"I don't know the exact profit. I think it is about $6000."

He said he would donate all profits made to charity.

Transurban is an Australian-owned company which builds and operates toll roads across Australia, the US and Canada.

It owns concessions across Sydney, including WestConnex, NorthConnex and the M2.

It comes after high-profile Labor candidate Terry Campese was forced to walk away from the seat of Monaro.

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Takitimu-Waihirere marae in Wairoa needs urgent help with clean-up.