Australia's hotel quarantine system has been an extremely effective first line of defence against Covid-19.
The country has largely eliminated the virus, often going weeks without a locally acquired infection. Hotel quarantine is credited a huge part of that success.
But a series of isolated local cases in recent months - all from hotel quarantine leaks - have caused alarm.
Since November, three cities have entered snap lockdowns on the back of such infections, aiming to halt outbreaks at their source.
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