After battling – for more than a year – the SARS-CoV-2 pandemic and its successive waves affecting different regions of the world, the medical community, regardless of the specialization its members represent, has achieved a basic understanding of the main problems this virus poses. The knowledge gained throughout the pandemic concerns a wide range of issues – from the course of the disease, which is often unpredictable, through the methods of therapeutic treatment, to the emergence of the post-COVID phenomena. Since the emergence of the pandemic one of the fundamental problems encountered by the medical community has been the identification of factors that negatively influence the outcome of the infection and those that seem beneficial for the patients.