As the pandemic of coronavirus disease 2019 (COVID-19) continues to emerge worldwide with no country being spared [1], scientists and researchers are relentlessly looking for the origin of SARS-CoV-2 [2]. However, previous outbreaks of coronaviruses, particularly the SARS epidemic that emerged in 2002 [3] and later the MERS outbreak in 2012 [4], might in fact be viewed as a warning of future human coronaviruses-related pandemics. The close resemblance of the viral genome structures of SARS-CoV-2 and SARS virus (SARS-CoV) [5] makes the assumption more accurate.
