VIRGINIA TRIOLI: Professor, thanks for talking to us today. You said today that the Australian Health Protection Principal Committee doesn't provide advice on border closures, but given that decision has now been made between Victoria and New South Wales, in your medical view, is this an effective measure against the Victorian spike spreading?PROFESSOR MICHAEL KIDD: Well, certainly this decision has been made, I understand, in consultation with the premiers and also with the Prime Minister as a way of preventing further transmission from occurring.