Introduction

In this third year of the SARS-CoV-2 pandemic responsible for COVD-19 and related diseases worldwide, the scientific studies and reviews focused on this virus and its variants are still crucial. The third volume of the Coronaviruses series brings together some essential data regarding the origin, pathology and chemotherapeutic drugs to treat coronavirus infections. Contributions are written by experienced researchers with the goal of updating medical researchers and clinicians dealing with COVID-19 patients. It presents seven chapters covering a range of topics: (1) bat coronaviruses in the world, (2) hospital challenges during the COVID-19 pandemic, (3) the pro-inflammatory and thrombotic manifestations and the therapeutic options of Covid-19, (4) the common and rare dermatologic manifestations registered in COVID-19 patients, (5) the circulating biomarkers of cardiopulmonary disturbances in COVID-19, and (6) the aspects of pathology and pathogenesis of coronavirus infection.