Coronavirus disease 2019 (COVID-19) is a novel respiratory infectious disease caused by the severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2), which has reopened the issue of the role and importance of coronaviruses in human pathology (World Health Organization, 2020a). In fact, only seven coronaviruses are known to be zoonotic, with the ability to jump from animals to humans. Four of them cause mild illnesses, such as the common cold, while the other three types have had more catastrophic consequences: severe acute respiratory syndrome coronavirus (SARS-CoV), Middle East respiratory syndrome coronavirus (MERS-CoV), and now SARS-CoV-2 (Čivljak et al., 2020).
