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並前往https://www.ecdc.europa.eu/sites/default/files/documents/COVID-19-Contract-tracing-scale-up.pdf

Contact tracing for COVID-19: current evidence - ECDC

It is possible to scale up contact tracing by adapting ... https://ec.europa.eu/health/sites/health/files/ehealth/docs/covid-19_apps_en.pdf.

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