Australian children aged five and under could be in line to receive a COVID-19 vaccination within a matter of weeks, the federal government has confirmed.

Federal Health Minister Mark Butler says the Therapeutic Goods Administration is considering an application from drug maker Moderna to allow its vaccines to be given to children aged from six months to five years old. 

“If it is approved by the TGA that will then go to our advisory group on vaccines to consider the way in which this should be rolled out to the community, so I’d expect it to be a matter of some weeks,” Mr Butler told reporters in Canberra on Tuesday. 

Earlier, Mr Butler told ABC radio, it would be “unthinkable” not to hold a royal commission into the nation’s pandemic response. 

“The amount of money spent, the death, the dislocation. We know a very long tail of mental and physical distress will be coming our way over the next couple of years,” he said. 

“It would be unthinkable not to have a very deep look at how we responded to that and learn the lessons.”

He said any inquiry need to be carried out over the next three years.

Meanwhile, Australians will have access to a single vaccine for COVID-19 and influenza by 2024 as clinical trials are set to begin.

The combined shot for flu, COVID-19 and respiratory virus RSV is in the early testing stages with trials to start later this year, Moderna chief medical officer Paul Burton said.

Dr Burton expects combined vaccines will be key to fighting respiratory diseases in the aftermath of the pandemic, and to adapting to multiple strains within one season.

He said bringing vaccines together and adapting will be the future, as the world considered diseases other than COVID-19.

Meanwhile, Australia’s multi-billion dollar mRNA manufacturing hub will be bigger than initially expected.

The first of its kind in the southern hemisphere, the facility was announced in March by the Morrison government as part of an agreement with Moderna.

Finding a location has reached its final stages and a site will be announced in a few weeks, the company’s general manager Michael Azrak said.

“It’s taken a little bit longer than we anticipated because we’re actually going to be building a larger facility than we anticipated,” he told Sky News.

The pharmaceutical giant aims to break ground on the Victorian site before the end of the year, Mr Azrak said.

It will be operating by the end of 2024, subject to approval by the medicines regulator.