Abstract
The outbreak of COVID-19 in mainland China was declared controlled after April 2020. Since then, the origins of all local outbreaks were imported cases of COVID-19 infection or imported articles contaminated with SARS-CoV-2. Human contact with contaminated items may result in infection, which can lead to local COVID-19 outbreaks and even multiple transmission chains caused by different SARS-CoV-2 strains circulating within the same area. This study aimed to explore the possible causes of local outbreaks caused by articles contaminated with SARS-CoV-2 and to share "item-to-human" origin-tracing methods.
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