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From ABC News:
Focussing testing in a hot spot, like the Bondi Beach cluster, makes obvious sense and it's certainly what's happening now.
But more random sampling (if and when we can) is important as well, and NHMRC Clinical Trials Centre biostatistics professor Ian Marschner said it's a long-standing statistical technique.
"You don't want to be biased towards testing just in hot spots, you want to spread that out over a range of different geographical areas," he said.