The incredible S. Korean #COVID19 nightclub outbreak response:

>40k tests revealed 246 confirmed cases: 39% primary & 61% secondary

This is the gold standard of how to effectively conduct contact tracing, especially in stigmatized populations (see below) https://bit.ly/2ZQpnJC 
"...prejudice against homosexuality, gay men in South Korea...discrimination & stigmatization...often unwilling to reveal their sexual identity. Thus, the Seoul Metropolitan Government consulted sexual-minority groups to discuss ways to encourage testing among gay men."👍👍👍👍
"To conduct contact tracing for this outbreak, we used multiple forms of advanced information technology, including location data from mobile devices, credit card payment history,...
....geographic positioning service data, drug utilization review, public transportation transit pass records, and closed-circuit television footage"

Phenomenal.
PS: Privacy...

The balance of privacy vs public safety/health is a debate that started long before #COVID19 & will continue long after.

The above is just an example of using tools at your disposal to rapidly and effectively quell what could have been a much larger outbreak.
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