This sourcebook offers basic information on the coronavirus and COVID-19 infection. It provides facts about its origin, how it spreads, earlier outbreaks, variants, symptoms, risk factors, clinical presentation in specific populations and pets and animals, and the statistics of its cases and deaths. It explains the protective and control measures such as social distancing, self-isolation, face masks, and disinfecting. The guidance for COVID-19 measures in schools, workplace, and other places are discussed. Clinical care and treatment information for COVID-19 provides detailed information on the investigation, treatment, vaccines, management, and ongoing research. Furthermore, this book illustrates the long COVID-19 infection, mental health issues, and the impact on the global economy, social, and lifestyle issues. It concludes with a glossary of terms related to COVID-19 and other infectious diseases and a list of resources for additional help and information about COVID-19 and other communicable diseases.