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What started with just four coronavirus cases in Melbourne a few days ago has now more than doubled, as close contacts are tracked down, isolated and tested. While cases are being linked to each other, how they relate back to a hotel quarantine breach in South Australia is still unclear. The other big challenge facing health authorities will be making sure every case is tracked down, but that's a job that gets harder with every new positive case. So on today's Coronacast, what are we hoping for in the days ahead? Also on today's show: * The TGA allows more flexibility for storing Pfizer vaccine * What information is there on how the vaccine works for people with blood disorders? * A few of your vaccination stories