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1.10am GMT

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12.57am GMT

Marshall is asked if he admits there have been shortcomings in South Australia's hotel quarantine system.

Not at all. There will be a thorough investigation but what we have said since day one is this is a highly contagious disease ... we know that, very highly trained nurses and with all of their PPE, they have been able to contract the disease, so we know there is a risk associated with every time we bring somebody into this country," he says.