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Nick Kyrgios says that not even a "brutal" fall which left him squirming in agony was going to stop him continuing his extraordinary adventures in Wimbledon wonderland.

After overcoming a nasty fall on the Court No.1 turf and rising like a heavyweight champ to win his epic battle with Frenchman Ugo Humbert on Wednesday, the irrepressible Kyrgios boomed: "With one leg, I was going to finish that match."

After the most brilliant contest of Wimbledon so far, the would-be holidaymaker now looks set for a very long vacation as he prevailed 6-4 4-6 3-6 6-1 9-7 after three hours and 26 minutes of dazzling fare that only this showman could conjure up.

"Not bad for a part-time player," he couldn't resist joking with the cheering crowd.

The 26-year-old reckoned he'd been in agony overnight on Tuesday after the pair's match had been called off just before the 11pm cut-off when locked at 3-3 in the fifth because of the strain of playing his first match for nearly six months.

And after he'd slipped and taken a bad fall when the scores reached 6-6 on resumption, it looked momentarily as he writhed around the court that he might have to pull out, just as Serena Williams and Adrian Mannarino had done after tumbles the day earlier.

"I was always going to get up and play. I made it that far. I haven't been playing many tournaments. I'm here," he said.

"I'm like, 'Ah, going down' - it was pretty brutal. It hurt. My hip hurt.

"I just got back up and showed some resilience. Comes with age."

And real heart. Twice he found himself a couple of points away from defeat, yet just as in the pair's last magnificent five-set tussle in Melbourne at the Australian Open, Kyrgios just would not be denied, finally breaking Humbert to go into an 8-7 lead.

He then still had to repel two break points from the brilliant young French 21st seed before banging an unreturnable serve down the T for one of the most dramatic wins of even his astounding career.

"My hip's fine," he reported later. "Very lucky. Obviously it's devastating to see some big names go out due to an injury like slipping on the court.

"Mannarino was putting on a great match against Federer. Obviously seeing Serena, the legend, go down, it's not easy. I'm very lucky it wasn't nothing too severe.

Before going back out on court for the resumption, Kyrgios could be heard revealing how much he fancied a beer at the Dog and Fox, the Wimbledon Village pub he'd famously frequented before his contest with Rafael Nadal two years ago.

Alas, the bubble was going to put a stop to any such fun - but everyone at Wimbledon was just thrilled he was the one providing them with pleasure.

How, they wondered, could a man who hasn't played for so long be so brilliant just four days after crossing the world?

"A lot of people were telling me there's no chance, there's no point in you going with that short preparation, no chance you can come off the couch and compete at this level.

"I'm like, 'Dude, I know my game, I know how to play on grass.' I've been playing this sport since I was seven years old.

"I don't really care what anyone says. I'm my own person. I prepare the way I prepare and it worked. I'm not scared of anyone in the draw."

Italy's Gianluca Mager, the world No.77 is the next guest on the Kyrgios show.

© AAP 2021

Scott Morrison has been accused of throwing a grenade into the vaccine rollout as doctors and state health officers warn against widespread AstraZeneca jabs.

The prime minister's snap announcement highlighting a path for any adult to receive the coronavirus vaccine has opened fresh divisions with premiers and chief ministers.

Australian Medical Association president Omar Khorshid said doctors, the health department and the wider medical profession were not given advance warning.

"There's a lot of confusion out there," he told Sky News on Wednesday.

"Unfortunately the prime minister's thrown a little bit of a hand grenade into our vaccine program."

The federal government has provided doctors with legal protection to vaccinate adults of all ages, sparking a rush of younger people keen to have AstraZeneca.

But Australian Technical Advisory Group on Immunisation's official advice has not changed.

It is not recommended for people under 60 to receive AstraZeneca because risks of extremely rare but serious blood clots outweigh benefits.

Queensland Premier Annastacia Palaszczuk and the state's Chief Health Officer Jeannette Young actively discouraged under-40s from getting AstraZeneca through their GP.

"I don't want an 18-year-old in Queensland dying from a clotting illness who, if they got COVID probably wouldn't die," Dr Young said.

WA Premier Mark McGowan also wants people in his state to follow ATAGI's medical advice.

"That is the advice we have and that is the national advice from the immunisation experts," he said.

"Clearly, the Commonwealth has taken a different approach."

Ms Palaszczuk challenged Scott Morrison to explain whether federal cabinet made the decision to change the vaccine advice.

NSW Chief Health Officer Kerry Chant said ATAGI's advice should be respected.

Dr Khorshid said the mixed messages stemming from the prime minister's statement proved vaccine information should be left to experts.

"Today shows why we need to keep the politicians out of health discussions and leave them between patients and their doctors," he said.

People willing to take the AstraZeneca shots are able to do so after consulting with their GP to discuss the remote risk of rare blood clots.

Two people have died from the clotting disorder out of more than 3.8 million doses of AstraZeneca administered.

Federal Health Minister Greg Hunt said people should discuss vaccine options with their GP.

Mr Hunt said there was no change to the medical advice but noted Medicare items for consultations about vaccines and indemnity for doctors administering AstraZeneca were now in place.

"What we've done is simply acknowledged the existing informed consent decision," he said.

Federal Labor's health spokesman Mark Butler said Mr Morrison had inserted himself into a public health debate.

"This was pretty chaotic freelancing by the prime minister," Mr Butler told Sky News.

More than 12 million people are under lockdown across NSW, Queensland, Western Australia and the Northern Territory.

Just over seven per cent of Australians have been fully vaccinated, with the country lagging behind all other major economies.

© AAP 2021

South Australia has dodged an immediate lockdown after confirming five local COVID-19 infections, but the SA's peak business group says the state remains on a "knife's edge" in its battle to contain the virus.

The new cases involve a miner, who recently returned from the Northern Territory, his wife and three of their children, all aged under 10.

"While this is a very concerning turn of events, we are very relieved this person and this family have been at home since Saturday," Mr Marshall said on Wednesday.

"South Australia is not going into a lockdown and I think many people will be extraordinarily relieved about that."

The premier said the family had all been transferred to Adelaide's dedicated facility for positive coronavirus cases.

Their infections were regarded as "linked transmissions" from the NT's mine exposure site.

The other 28 miners who returned from the same facility near Alice Springs have also been in isolation since arriving in SA and are being retested.

All have returned negative results so far.

Chief Public Health Officer Nicola Spurrier said officials had moved to require anyone on the same Alice Springs to Adelaide flight as the infected miner on Friday, to go into isolation.

More than 100 people who were on board VA1742 have already been contacted with a small number still to be notified.

Checking is also underway to identify any possible contacts at Adelaide Airport and at a suburban takeaway food outlet the man visited on his way home.

Both those locations are considered low risk.

Professor Spurrier said while the outbreak was regarded as contained at this stage, more work remained to be done and officials did not want the Delta strain of the virus to become widespread in the community.

"What we're seeing with this Delta variant is there's almost a 100 per cent hit rate for close contacts," she said.

Business SA said the five new cases had "shaken" the state's confidence and SA remained at high risk of "leakages".

"South Australia is walking on a knife's edge at the moment, and we must all be vigilant to ensure this does not go any further," Chief Executive Martin Haese said.

"We must do everything we can to avoid going into a lockdown like we have seen in most other jurisdictions this week."

In response to the new cases, SA's transition committee has reduced the number of people allowed at family gatherings to just 10.

Premier Marshall said people were also being advised to work from home where possible, wear masks when out in public, use QR codes, get vaccinated and observe social distancing.

"We can see the consequences of getting this wrong. We don't want a lockdown in South Australia," the premier said.

Amid reports of panic buying across SA supermarkets, the premier said there was no need for such action.

The shop workers' union said people rushing to supermarkets would only increase the risk of community transmission.

"There is no need for South Australians to panic about stock levels in supermarkets and there is absolutely no excuse for abusive behaviour towards retail workers," SDA state secretary Josh Peak said.

© AAP 2021