The plethora of miscommunication and disinformation about how SARS-CoV-2 (COVID-19) spreads suggests a widespread misunderstanding of how viruses work. This book will focus on the interpretation of scientific and medical results, giving the reader guidance on interpreting virological data, including the concepts of 'live' versus infectious virus. The first section covers the background of virology and immunology, introducing the reader to the science of virology (using COVID-19 as an illustration) and considers the measurement of infectious disease, using polymerase chain reaction (PCR),...