Covid test and trace: how does UK compare with other countries?

Successful schemes in South Korea and Germany show speed and targeting are key

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As chaos continues to engulf Britain's test and trace system, attention has focused on how successful other countries have been in using testing and contact-tracing to suppress coronavirus transmission.

While many have embraced test/trace regimes, comparing the relative successes - and failures - is complicated by the fact that different countries count things even as basic as the number of daily tests using different methods.