How coronavirus took hold in North America and in Europe –

Early interventions were effective at stamping out coronavirus infections before they spread, according to a new study. Combining virus genomics with epidemiologic simulations and travel records, the research shows that in both the United States and in Europe, sustained transmission networks became established only after separate introductions of the virus that went undetected.

Source: How coronavirus took hold in North America and in Europe — ScienceDaily

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