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Keywords: Isolation; quarantine; SARS-CoV-2; Beta variant; Alpha variant; COVID-19; transmission; international travel EN Isolation quarantine SARS-CoV-2 Beta variant Alpha variant COVID-19 transmission international travel 1 2 2 01/05/22 20211201 NES 211201 Quarantine of international travelers at arrival, often in specialized quarantine centers or hotels, is a measure frequently used by many countries to reduce the risk of importation.[1-2, 3] Evidence of the risk for transmission by contaminated environment or fomites via infected travellers from such quarantine facilities is lacking. Isolation, quarantine, SARS-CoV-2, Beta variant, Alpha variant, COVID-19, transmission, international travel Environmental surfaces from their quarantine rooms were sampled and tested for SARS-CoV-2, using the same methods as reported in a previous study.4 In total, 22 environmental samples collected from 11 sampling sites of each quarantine room were taken. [Extracted from the article]