Mr BUTLER (Hindmarsh—Deputy Manager of Opposition Business) (14:47): My question is to the Prime Minister. The infection which sparked Melbourne's latest outbreak was caused by aerosol spread of the virus in hotel quarantine in Adelaide, the latest in a series of outbreaks caused by poor ventilation in hotel quarantine. Given the Prime Minister's refusal to create a safe national quarantine system, why has the Prime Minister failed to implement strong national standards on ventilation to prevent these repeated outbreaks from hotel quarantine?