Most of Australia's biggest cities have seen snap COVID-19 lockdowns, but none as frequently or devastatingly as Melbourne. 

Today, the people of the Victorian capital entered their fourth lockdown since the beginning of the pandemic as part of state-wide measures to curb a growing number of cases. 

But why does this keep happening in Melbourne?

Is it the response, the rules, the roll out? 

Melbourne epidemiologist Prof. Nancy Baxter says it's mostly bad luck, and other cities could be next.

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