The goal of prospective tracing is to stop ongoing transmission. Retrospective tracing looks back to detect clusters and transmission venues.
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Future Biden administration, take note: "looking forward, not backward," is unhealthy and dangerous because it lets diseases spread unchecked. You will need to look forward AND backward.
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And are they really even doing that? There were reports early on that they were doing contact tracing but nobody has said they were notified by WH group.
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