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Mapping Covid in NZ: Genome says?

Summary:
Things I learned from what looks to be a superb study on Covid in New Zealand using genetic analysis of 56% of all confirmed cases:Only 19% of cases that came into New Zealand resulted in more than one additional person being infected while 24% led to a single additional infection - presumably policy substantially reduced transmission;Lockdown reduced R-naught of our biggest cluster from 7 to 0.2 within a week;The 649 cases analysed showed 277 separate introductions of the virus into New Zealand;There is no evidence of the virus circulating before the first reported case on 26 February;The largest cluster came from the US, and North America provided most of the cases resulting in transmission linkages.I was very worried in February that it had already gotten here. Somehow, it hadn't.

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Things I learned from what looks to be a superb study on Covid in New Zealand using genetic analysis of 56% of all confirmed cases:
  1. Only 19% of cases that came into New Zealand resulted in more than one additional person being infected while 24% led to a single additional infection - presumably policy substantially reduced transmission;
  2. Lockdown reduced R-naught of our biggest cluster from 7 to 0.2 within a week;
  3. The 649 cases analysed showed 277 separate introductions of the virus into New Zealand;
  4. There is no evidence of the virus circulating before the first reported case on 26 February;
  5. The largest cluster came from the US, and North America provided most of the cases resulting in transmission linkages.
I was very worried in February that it had already gotten here. Somehow, it hadn't. We've been very lucky. 

Oh, and obviously, lockdown worked. 

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