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As the world struggles with the new coronavirus (COVID-19) pandemic, contact tracing apps of various types have been adopted in many jurisdictions for combating the spread of the virus. However, even if successful in containing the virus within national borders, these apps are becoming ineffective as international travel is gradually resumed. The problem rests in the plurality of apps and their inability to operate in a synchronized manner, as well as the absence of an international entity withdoi:10.2196/23194 pmid:33156804 fatcat:x55zjqnlbngl7k6kz5m2w4drsi