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The COVID-19 pandemic has significantly threatened the health and well-being of humanity. Contact tracing (CT) as an important non-pharmaceutical intervention is essential to containing the spread of such an infectious disease. However, current CT solutions are fragmented with limited use of sensing and computing technologies in a scalable framework. These issues can be well addressed with the use of the Internet of Things (IoT) technologies. Therefore, we need to overview the principle,doi:10.3390/s21217124 pmid:34770431 pmcid:PMC8587965 fatcat:qwt3g4av5vcffb4fnsg7p24mnq