In this book are analyzed topics related to COVID-19 which form the basis of the understanding of the multiple aspects related to the protection of public health, and which will allow the reader to broaden his or her understanding of how the system of preparation for the global pandemic is developed. Today, on the eve of the first fifth of the twenty-first century, we have new tools which allow us the management of pandemics. Will be described what are those tools, deepening several topics...