This is exactly the kind of situation where you want public health authorities to have cell phone location data, however coarse-grained it is, to create a list of possible contacts. Note that a bluetooth contact tracing app would be (even more) useless in this case https://twitter.com/samdolnick/status/1259491120188456963 …
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If you know there was a spreading event at location X, and you have some way to narrow down the list of people potentially exposed from "everybody in Seoul" to a list of 20,000 phone numbers, that strikes me as an extraordinarily valuable tool
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And the likelihood that there's no other data source that can help winnow that list strikes me as low
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