The chemicals required for testing were in short supply around the world.
South Korea wasn't initially testing everybody and the people were ok with what was required for Tracing purposes.
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This includes enforcing a law that grants the government wide authority to access data: CCTV footage, GPS tracking data from phones and cars, credit card transactions, immigration entry information, and other personal details of people confirmed to have an infectious disease. The authorities can then make some of this public, so anyone who may have been exposed can get themselves - or their friends and family members - tested.
In addition to helping work out who to test, South Korea’s data-driven system helps hospitals manage their pipeline of cases. People found positive are placed in self-quarantine and monitored remotely through a smartphone app, or checked regularly in telephone calls, until a hospital bed becomes available.
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