The head of Australia's vaccine task force wants young people living in Sydney to get vaccinated as quickly as possible as the city's coronavirus crisis worsens.
The federal government has released a graphic ad showing a young woman struggling to breathe after contracting the virus.
It has been broadcast in Sydney as the city struggles with a growing outbreak, reporting 112 new cases on Monday.
There are 63 COVID-19 patients in hospital in NSW. Of those, 14 are under the age of 35 and 18 are in intensive care.
NSW Chief Health Officer Kerry Chant said these numbers dispelled the myth young people would not get sick from the virus.
The state's mass vaccination hubs and pharmacies will now start offering AstraZeneca vaccines to people aged over 40.
Lieutenant General John Frewen said the graphic ad showing a young woman gasping for air was designed to be confronting.
He urged people aged under 40 living in hotspot areas to talk to their doctor about getting the AstraZeneca vaccine, despite Pfizer being preferred for that age group.
Lt Gen Frewen said people in south west Sydney needed to weigh up the risks of getting coronavirus against the vaccine advice.
"Those people between 18 and 40 need to make a decision now about whether they want to take their chances with the Delta virus or whether they want to get down, have a discussion with their GPs and get AstraZeneca," he said.
Health Minister Greg Hunt says additional business payments and mental health supports will also be unveiled soon.
Sydney cafes, bars and pubs remain in lockdown and forced to limit their offerings to takeaway and delivery.
Two million medical-grade masks from the national stockpile are being dispatched to primary health networks across Sydney.
Gloves, gowns and goggles will also be distributed.