“…Introduction of SARS-CoV-2 through migration has been documented in other countries and has been studied as a natural disease diffusion process ( Adegboye et al, 2021 , Chu et al, 2021 , Escalera-Antezana et al, 2020 , Liu et al, 2020a , Menkir et al, 2021 , Russell et al, 2021 ). There are few studies regarding the effect of immigration on the COVID-19 pandemic and the basic reproduction number ( Adegboye et al, 2021 , Adhikari et al, 2021 , Chu et al, 2021 , Kassa et al, 2021 , Tilahun and Alemneh, 2021 ). In Adhikari et al (2021) , the authors found that during the controlled phase most of the recorded cases were imported from outside the country with a small number generated from local transmission.…”