Re: Covid 19 -
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That's not neccesarily an issue with the system. The system is only as good as the completeness and timeliness of data it has and that relies on people.
Naturally in some cases there won't be data to link cases because it stil comes down to a persons ability to provide accurate information of their exact whereabouts.
The high confidence comes from the fact that despite it jumping the line so to speak, we have not seen huge outbreaks. It isn't all luck mate, it must be pretty effective.
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