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Nature 587, 536-539 (2020)
Updates & Corrections
Correction 01 December 2020: This feature incorrectly stated that 20% of travellers to Iceland tested positive for COVID-19 in a second round of testing five days after they arrived. In fact, 20% of the travellers who tested positive did so only in that second round. It also understated the daily number of infections in October. it has now been updated.
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