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Is there any information on how many of the ~377 Australian cases originated outside versus inside their borders? I can't find much on that figure.

South Africa only has 62 cases and New Zealand only has 8 cases. Not much there yet.

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I haven't seen any statistics, but it appears that Rita Wilson and her husband contracted it in Australia from what I've read. That was the more worrying thing to me about that news than the celebrity connection.

Two global travelers with frequent contact to other global travelers doesn't prove much.

It's anecdata for sure. Apparently though, at least one TV reporter contracted the virus after being in contact with Rita Wilson. Again, anecdata, but it points towards the idea that there is local transmission.

Well, in Brazil it's officially known that there has been domestic transmission in both São Paulo (that has been cold, much like a summer in North Europe) and Rio de Janeiro (that has been quite hot on the last few days).

More humid there, easier for microorganism travel.

Fist off, its a virus not a microorganism. Second, high humidity reduces the spread of viruses. That is why you get the common cold more often in winter, when it is very dry.

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