From KUT:
The first thing you should know about contact tracing is that it’s time-tested. It’s been around for a long time — one of the original weapons in the public health arsenal for fighting infectious diseases. It was used before vaccines. Before antibiotics. Before we knew most of what we know now about infectious disease.
It’s still used routinely for things like tuberculosis and sexually transmitted infections.
It starts with a known or suspected case.
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