PLoS One. 2021 May 14;16(5):e0251867. doi: 10.1371/journal.pone.0251867. eCollection 2021. Contact tracing has historically been used to retard the spread of infectious diseases, but if it is exercised by hand in large-scale, it is known to be a resource-intensive and quite deficient process. Nowadays, digital contact tracing has promptly emerged as an indispensable asset in the global fight against the coronavirus pandemic.