After 31 August 2020, most replicates (nine or more) exhibited a negative trend for all countries, indicating a decrease in transmission chain size over time.
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The impact of public health interventions in the Nordic countries during the first year of SARS-CoV-2 transmission and evolution.
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The sentences
We also regressed the duration of transmission chains against detection date, where a positive trend means that transmission chains detected later in the pandemic tended to last longer.