Face mask virus covid-19
(Image: Unsplash/Claudio Schwarz)

The docking of the luxury cruise ship Ruby Princess and its 1148 crew and 2647 passengers at Sydney's Circular Quay last Friday may constitute the single biggest contributor to Australia's coronavirus crisis.

Here's what happened in the lead-up to a debacle that should never have happened.

March 6: Federal government publishes the National Protocol for Managing Novel Coronavirus Disease (COVID-19) Risk From Cruise Ships, which states “provided there are no concerns about the COVID-19 risk, profile of a ship or suspected COVID-19 cases reported" a ship may be allowed to continue its voyage.