Biosensors have been employed for numerous applications from medical diagnosis, environmental monitoring, pharmaceutical analysis, food quality testing to defence and security purposes. Their development encompasses chemistry, physics, materials science, nanotechnology, and engineering. Being at the intersection of these multiple disciplines, this book is suitable for academic, clinical, and commercial researchers, as well as graduate students. This book reviews the latest studies and developments in the use of a range of biosensor platforms for the analysis of viral infections. Following an introduction to viruses and the importance of virus detection for medical applications the book introduces the properties, fabrication, characterization, applications, and recent research regarding optical, electrochemical, piezoelectric, fluorescence, thermal, magnetic, and micromechanical sensor families. It further embraces state-of-art technological developments that incorporate additional platforms such as microfluidic systems, lab-on-a-chip tools, and molecular imprinting techniques, and also includes relevant chemistry, physics, biology, medicine, and nanotechnology. In each case, the use and potential of each biosensor for viral detection are explained, and these points have been elaborated for the applications in Coronavirus, HIV, Hepatitis, Ebola, Zika, Norovirus, Influenza, SARS, and others.