The Ruby Princess, which has been responsible for hundreds of coronavirus infections and more than 20 deaths, will leave Australian waters today.

Key points: About one in 10 coronavirus cases throughout Australia are linked to the Ruby Princess

About one in 10 coronavirus cases throughout Australia are linked to the Ruby Princess The ACT has the highest proportion of Ruby Princess cases overall

The ACT has the highest proportion of Ruby Princess cases overall Tasmanian authorities are working to determine if Ruby Princess infections led to an outbreak of 114 cases

But how would the coronavirus pandemic look in Australia if the ship had never arrived?

Although the ship makes its long-awaited departure for the Philippines today, the consequences of it ever docking are irreversible.

As of Wednesday, about one in every 10 cases of coronavirus in Australia could be linked to the Ruby Princess.

And of the 75 people who have died in Australia, 21 of those were connected to the ship's disastrous journey to New Zealand.

The ship's disembarkation at Circular Quay on March 19 sparked a public blame game between authorities.

The day before the ship docked, cases in NSW had tipped just over the 300 mark but the state had recorded a daily decrease in cases.

By March 20, there was a spike and the state's Health Minister told media he was "concerned" about the Ruby Princess and several passengers had already returned positive results.

Fast-forward more than a month and NSW recorded eight Ruby Princess passenger deaths and of the state's 2,971 coronavirus cases, almost 13 per cent were linked to the ship.

State Ruby Princess cases Total cases NSW 390 2,971 SA 89 437 QLD 85 1,024 WA 54 546 VIC 33 1,336 ACT 21 104 TAS 22 202 NT 2 27 TOTAL 696 6,647

Tasmanian authorities said it was most likely a Ruby Princess passenger with a confirmed case of COVID-19 that led to an outbreak of 114 cases in the state's north west.

Two Ruby Princess passengers died at the North-West Regional Hospital and the 114 infections were spread between North-West and its associated private hospital.

A third Ruby Princess passenger also died in Hobart and there have been 19 other confirmed coronavirus cases linked to the Ruby Princess across Tasmania. Overall, infections from the cruise make up more than 10 per cent of the state's cases.

South Australia has the highest proportion of Ruby Princess-linked cases of any state at 20.3 per cent.

Two passengers, aged 74 and 62, died in Adelaide, 78 other passengers have tested positive and nine others have been recorded as secondary infections.

There would be 20.1 per cent fewer coronavirus cases in the ACT if it weren't for the Ruby Princess.

Eighteen people from the capital state were infected on board and three secondary infections have since been identified.

One of the seven people who have died in Western Australia was a Ruby Princess passenger and 53 other cases have been linked to the voyage, representing nearly 10 per cent of all cases.

In Queensland, three passengers have died and Ruby Princess infections make up around 8 per cent of all cases.

In the top end, a Darwin couple was diagnosed with COVID-19 after returning from the cruise, representing 7 per cent of the state's cases.

Lastly, Victoria has the lowest proportion of infections from the ship by population (2 per cent) and has no passenger deaths.

But not all passengers were hopping from one state to another, others moved across the world to get home.

So far the ABC has traced at least 36 international cases of coronavirus to the Ruby Princess.

A police investigation and an inquiry are taking place as the Carnival Corporation insists the cruise ship followed all necessary protocols.