These are turbulent times with the novel disease, COVID-19 engulfing, imprisoning, and debilitating the humanity all over the Globe. This book is based on based on the author's research and review articles related to COVID-19, which have been published in various international medical journals during last fourteen months. As the knowledge base about COVID19 is fast evolving, an update is actually required if not weekly, at least on monthly forming a scientific basis for the clinicians, researchers, epidemiologists, and policy planners to deal with the pandemic, and allay vast circulating...